Magnetic brightening and control of dark excitons in monolayer WSe2

Zhang, Xiao -Xiao; Cao, Ting; Lu, Zhengguang; Lin, Yu -Chuan; Zhang, Fan; Wang, Ying; Li, Zhiqiang; Hone, James C.; Robinson, Joshua A.; Smirnov, Dmitry; Louie, Steven G.; Heinz, Tony F.

doi:10.1038/NNANO.2017.105

Title: Magnetic brightening and control of dark excitons in monolayer WSe₂

Abstract

Monolayer transition metal dichalcogenide crystals, as direct-gap materials with strong light-matter interactions, have attracted much recent attention. Because of their spin-polarized valence bands and a predicted spin splitting at the conduction band edges, the lowest-lying excitons in WX 2 (X = S, Se) are expected to be spin-forbidden and optically dark. To date, however, there has been no direct experimental probe of these dark excitons. Here, we show how an in-plane magnetic field can brighten the dark excitons in monolayer WSe 2 and permit their properties to be observed experimentally. Precise energy levels for both the neutral and charged dark excitons are obtained and compared with ab initio calculations using the GW-BSE approach. As a result of their spin configuration, the brightened dark excitons exhibit much-increased emission and valley lifetimes. These studies directly probe the excitonic spin manifold and reveal the fine spin-splitting at the conduction band edges.

Authors:

Zhang, Xiao -Xiao ^[1]; Cao, Ting ^[2]; Lu, Zhengguang ^[3]; Lin, Yu -Chuan ^[4]; Zhang, Fan ^[5]; Wang, Ying ^[3]; Li, Zhiqiang ^[6]; Hone, James C. ^[5]; Robinson, Joshua A. ^[4]; Smirnov, Dmitry ^[6]; Louie, Steven G. ^[2]; Heinz, Tony F. ^[7]

Columbia Univ., New York, NY (United States); Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
National High Magnetic Field Lab., Tallahassee, FL (United States); Florida State Univ., Tallahassee, FL (United States)
The Pennsylvania State Univ., University Park, PA (United States)
Columbia Univ., New York, NY (United States)
National High Magnetic Field Lab., Tallahassee, FL (United States)
Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)

Publication Date:: 2017-06-26

Research Org.:: SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Betty and Gordon Moore Foundation

OSTI Identifier:: 1367175

Alternate Identifier(s):: OSTI ID: 1458504

Grant/Contract Number:: AC02-76SF00515; GBMF4545; FA9550-14-1-0040; AC02-05CH11231; DMR-1508412; DMR-1420634; DMR-1157490

Resource Type:: Accepted Manuscript

Journal Name:: Nature Nanotechnology

Additional Journal Information:: Journal Volume: 12; Journal Issue: 9; Journal ID: ISSN 1748-3387

Publisher:: Nature Publishing Group

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Zhang, Xiao -Xiao, Cao, Ting, Lu, Zhengguang, Lin, Yu -Chuan, Zhang, Fan, Wang, Ying, Li, Zhiqiang, Hone, James C., Robinson, Joshua A., Smirnov, Dmitry, Louie, Steven G., and Heinz, Tony F. Magnetic brightening and control of dark excitons in monolayer WSe2.  United States: N. p., 2017. 
        Web.  doi:10.1038/NNANO.2017.105.

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                    Zhang, Xiao -Xiao, Cao, Ting, Lu, Zhengguang, Lin, Yu -Chuan, Zhang, Fan, Wang, Ying, Li, Zhiqiang, Hone, James C., Robinson, Joshua A., Smirnov, Dmitry, Louie, Steven G., & Heinz, Tony F. Magnetic brightening and control of dark excitons in monolayer WSe2.  United States.  doi:https://doi.org/10.1038/NNANO.2017.105

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                    Zhang, Xiao -Xiao, Cao, Ting, Lu, Zhengguang, Lin, Yu -Chuan, Zhang, Fan, Wang, Ying, Li, Zhiqiang, Hone, James C., Robinson, Joshua A., Smirnov, Dmitry, Louie, Steven G., and Heinz, Tony F. Mon .  
        "Magnetic brightening and control of dark excitons in monolayer WSe2".  United States.  doi:https://doi.org/10.1038/NNANO.2017.105.  https://www.osti.gov/servlets/purl/1367175.

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@article{osti_1367175,

  title        = {Magnetic brightening and control of dark excitons in monolayer WSe2},

  author       = {Zhang, Xiao -Xiao and Cao, Ting and Lu, Zhengguang and Lin, Yu -Chuan and Zhang, Fan and Wang, Ying and Li, Zhiqiang and Hone, James C. and Robinson, Joshua A. and Smirnov, Dmitry and Louie, Steven G. and Heinz, Tony F.},

  abstractNote = {Monolayer transition metal dichalcogenide crystals, as direct-gap materials with strong light-matter interactions, have attracted much recent attention. Because of their spin-polarized valence bands and a predicted spin splitting at the conduction band edges, the lowest-lying excitons in WX 2 (X = S, Se) are expected to be spin-forbidden and optically dark. To date, however, there has been no direct experimental probe of these dark excitons. Here, we show how an in-plane magnetic field can brighten the dark excitons in monolayer WSe 2 and permit their properties to be observed experimentally. Precise energy levels for both the neutral and charged dark excitons are obtained and compared with ab initio calculations using the GW-BSE approach. As a result of their spin configuration, the brightened dark excitons exhibit much-increased emission and valley lifetimes. These studies directly probe the excitonic spin manifold and reveal the fine spin-splitting at the conduction band edges.},

  doi          = {10.1038/NNANO.2017.105},

  journal      = {Nature Nanotechnology},

  number       = 9,

  volume       = 12,

  place        = {United States},

  year         = {2017},

  month        = {6}

}

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DOI: https://doi.org/10.1038/NNANO.2017.105

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Fig. 1: Conduction band structure of monolayer WSe₂ and magnetic brightening of dark excitons. a, False color plot of the measured emission spectrum for monolayer WSe₂ at a temperature of 30 K as a function of the strength of the applied B_||. The displayed energy range includes emission from themore »

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journal, October 2017

Ye, Jialiang; Niu, Binghui; Li, Ying
Applied Physics Letters, Vol. 111, Issue 15
DOI: 10.1063/1.4995517

Plasmon induced brightening of dark exciton in monolayer WSe ₂ for quantum optoelectronics
journal, May 2019

Arora, Ankit; Dixit, Tejendra; Anil Kumar, K. V.
Applied Physics Letters, Vol. 114, Issue 20
DOI: 10.1063/1.5093664

Valley dynamics of different trion species in monolayer WSe ₂
journal, August 2019

Fu, Jiyong; Cruz, Junio M. R.; Qu, Fanyao
Applied Physics Letters, Vol. 115, Issue 8
DOI: 10.1063/1.5112823

Investigation of indirect excitons in bulk 2H-MoS ₂ using transmission electron energy-loss spectroscopy
journal, April 2018

Habenicht, Carsten; Schuster, Roman; Knupfer, Martin
Journal of Physics: Condensed Matter, Vol. 30, Issue 20
DOI: 10.1088/1361-648x/aabd02

Optically dark excitonic states mediated exciton and biexciton valley dynamics in monolayer WSe ₂
journal, June 2018

Zhang, Minghua; Fu, Jiyong; Dias, A. C.
Journal of Physics: Condensed Matter, Vol. 30, Issue 26
DOI: 10.1088/1361-648x/aac61a

Dynamical screening in monolayer transition-metal dichalcogenides and its manifestations in the exciton spectrum
journal, March 2019

Scharf, Benedikt; Van Tuan, Dinh; Žutić, Igor
Journal of Physics: Condensed Matter, Vol. 31, Issue 20
DOI: 10.1088/1361-648x/ab071f

Singlet and triplet trions in WS ₂ monolayer encapsulated in hexagonal boron nitride
journal, June 2018

Vaclavkova, D.; Wyzula, J.; Nogajewski, K.
Nanotechnology, Vol. 29, Issue 32
DOI: 10.1088/1361-6528/aac65c

Orbital, spin and valley contributions to Zeeman splitting of excitonic resonances in MoSe ₂ , WSe ₂ and WS ₂ Monolayers
journal, October 2018

Koperski, Maciej; Molas, Maciej R.; Arora, Ashish
2D Materials, Vol. 6, Issue 1
DOI: 10.1088/2053-1583/aae14b

Probing the exciton k-space dynamics in monolayer tungsten diselenides
journal, March 2019

Yan, Tengfei; Yu, Hongyi; Xiao, Ke
2D Materials, Vol. 6, Issue 2
DOI: 10.1088/2053-1583/ab0a4e

Magnetic brightening, large valley Zeeman splitting, and dynamics of long-lived A and B dark excitonic states in monolayer ${WS}_{2}$
journal, September 2019

Bragança, Helena; Vasconcelos, Railson; Fu, Jiyong
Physical Review B, Vol. 100, Issue 11
DOI: 10.1103/physrevb.100.115306

Fine structure and lifetime of dark excitons in transition metal dichalcogenide monolayers
journal, October 2017

Robert, C.; Amand, T.; Cadiz, F.
Physical Review B, Vol. 96, Issue 15
DOI: 10.1103/physrevb.96.155423

Dark excitations in monolayer transition metal dichalcogenides
journal, November 2017

Deilmann, Thorsten; Thygesen, Kristian Sommer
Physical Review B, Vol. 96, Issue 20
DOI: 10.1103/physrevb.96.201113

Spin-orbit-stable type-II nodal line band crossing in $n$ -doped monolayer $Mo X_{2}$ ( $X = S$ , Se,Te)
journal, December 2018

Kim, Kyung-Han; Yang, Bohm Jung; Lee, Hyun-Woo
Physical Review B, Vol. 98, Issue 24
DOI: 10.1103/physrevb.98.245422

Interlayer excitons in bilayer ${MoS}_{2}$ with strong oscillator strength up to room temperature
journal, January 2019

Gerber, Iann C.; Courtade, Emmanuel; Shree, Shivangi
Physical Review B, Vol. 99, Issue 3
DOI: 10.1103/physrevb.99.035443

Probing many-body interactions in monolayer transition-metal dichalcogenides
journal, February 2019

Van Tuan, Dinh; Scharf, Benedikt; Wang, Zefang
Physical Review B, Vol. 99, Issue 8
DOI: 10.1103/physrevb.99.085301

Layer degree of freedom for excitons in transition metal dichalcogenides
journal, April 2019

Das, Sarthak; Gupta, Garima; Majumdar, Kausik
Physical Review B, Vol. 99, Issue 16
DOI: 10.1103/physrevb.99.165411

Ultrafast dynamics of bright and dark positive trions for valley polarization in monolayer $WS e_{2}$
journal, June 2019

Shinokita, Keisuke; Wang, Xiaofan; Miyauchi, Yuhei
Physical Review B, Vol. 99, Issue 24
DOI: 10.1103/physrevb.99.245307

Magnetic Proximity Effects in Transition-Metal Dichalcogenides: Converting Excitons
journal, September 2017

Scharf, Benedikt; Xu, Gaofeng; Matos-Abiague, Alex
Physical Review Letters, Vol. 119, Issue 12
DOI: 10.1103/physrevlett.119.127403

Gate-Controlled Spin-Valley Locking of Resident Carriers in ${WSe}_{2}$ Monolayers
journal, September 2017

Dey, P.; Yang, Luyi; Robert, C.
Physical Review Letters, Vol. 119, Issue 13
DOI: 10.1103/physrevlett.119.137401

Optical Selection Rule of Excitons in Gapped Chiral Fermion Systems
journal, February 2018

Zhang, Xiaoou; Shan, Wen-Yu; Xiao, Di
Physical Review Letters, Vol. 120, Issue 7
DOI: 10.1103/physrevlett.120.077401

Gate Tunable Dark Trions in Monolayer ${WSe}_{2}$
journal, July 2019

Liu, Erfu; van Baren, Jeremiah; Lu, Zhengguang
Physical Review Letters, Vol. 123, Issue 2
DOI: 10.1103/physrevlett.123.027401

Optical and electronic properties of $2 H − Mo S_{2}$ under pressure: Revealing the spin-polarized nature of bulk electronic bands
journal, May 2018

Brotons-Gisbert, Mauro; Segura, Alfredo; Robles, Roberto
Physical Review Materials, Vol. 2, Issue 5
DOI: 10.1103/physrevmaterials.2.054602

Marrying Excitons and Plasmons in Monolayer Transition-Metal Dichalcogenides
journal, November 2017

Van Tuan, Dinh; Scharf, Benedikt; Žutić, Igor
Physical Review X, Vol. 7, Issue 4
DOI: 10.1103/physrevx.7.041040

High Efficiency Dark-to-Bright Exciton Conversion in Carbon Nanotubes
journal, December 2019

Ishii, A.; Machiya, H.; Kato, Y. K.
Physical Review X, Vol. 9, Issue 4
DOI: 10.1103/physrevx.9.041048

Colloquium : Excitons in atomically thin transition metal dichalcogenides
journal, April 2018

Wang, Gang; Chernikov, Alexey; Glazov, Mikhail M.
Reviews of Modern Physics, Vol. 90, Issue 2
DOI: 10.1103/revmodphys.90.021001

Detection of thermodynamic “valley noise” in monolayer semiconductors: Access to intrinsic valley relaxation time scales
journal, March 2019

Goryca, M.; Wilson, N. P.; Dey, P.
Science Advances, Vol. 5, Issue 3
DOI: 10.1126/sciadv.aau4899

Observation of chiral phonons
journal, February 2018

Zhu, Hanyu; Yi, Jun; Li, Ming-Yang
Science, Vol. 359, Issue 6375
DOI: 10.1126/science.aar2711

Nanophotonics with 2D transition metal dichalcogenides [Invited]
journal, January 2018

Krasnok, Alex; Lepeshov, Sergey; Alú, Andrea
Optics Express, Vol. 26, Issue 12
DOI: 10.1364/oe.26.015972

Figures / Tables found in this record:

Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

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Monolayers of semiconducting transition metal dichalcogenides (TMDCs) with unique spin-valley contrasting properties and remarkably strong excitonic effects continue to be a subject of intense research interests. These model 2D semiconductors feature two fundamental intravalley excitons species - optically accessible ' bright' excitons with anti-parallel spins and optically inactive 'dark' excitons with parallel spins. For applications exploiting radiative recombination of bright excitons or long lifetime dark excitons, it is essential to understand the radiative character of the exciton ground state and establish the energy separation between the lowest energy bright and dark excitons. Herein, we report a direct spectroscopic measure ofmore »« less
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Similar Records

Title: Magnetic brightening and control of dark excitons in monolayer WSe2

Abstract

Citation Formats

Figures / Tables:

Coupled Spin and Valley Physics in Monolayers of MoS 2 and Other Group-VI Dichalcogenides journal, May 2012

Experimental Evidence for Dark Excitons in Monolayer WSe 2 journal, December 2015

Exciton fine structure and spin decoherence in monolayers of transition metal dichalcogenides journal, May 2014

Breaking of Valley Degeneracy by Magnetic Field in Monolayer MoSe 2 journal, January 2015

Valley dynamics probed through charged and neutral exciton emission in monolayer WSe 2 journal, August 2014

Carrier and Polarization Dynamics in Monolayer MoS 2 journal, January 2014

Exciton exchange splitting in wide GaAs quantum wells journal, December 1999

Splitting between bright and dark excitons in transition metal dichalcogenide monolayers journal, March 2016

Spin-orbit engineering in transition metal dichalcogenide alloy monolayers journal, December 2015

Optical generation of excitonic valley coherence in monolayer WSe2 journal, August 2013

Emerging Photoluminescence in Monolayer MoS2 journal, April 2010

Spin and pseudospins in layered transition metal dichalcogenides journal, April 2014

BerkeleyGW: A massively parallel computer package for the calculation of the quasiparticle and optical properties of materials and nanostructures journal, June 2012

QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials journal, September 2009

Optical Signatures of the Aharonov-Bohm Phase in Single-Walled Carbon Nanotubes journal, May 2004

Valley- and spin-polarized Landau levels in monolayer WSe2 journal, October 2016

Direct measurement of exciton valley coherence in monolayer WSe2 journal, February 2016

k · p theory for two-dimensional transition metal dichalcogenide semiconductors journal, April 2015

Spectroscopic study of dark excitons in In x Ga 1 − x As self-assembled quantum dots by a magnetic-field-induced symmetry breaking journal, March 2000

Electron correlation in semiconductors and insulators: Band gaps and quasiparticle energies journal, October 1986

Large spin splitting in the conduction band of transition metal dichalcogenide monolayers journal, December 2013

Polarization analysis of excitons in monolayer and bilayer transition-metal dichalcogenides journal, September 2015

Three-band tight-binding model for monolayers of group-VIB transition metal dichalcogenides journal, August 2013

Giant spin-orbit-induced spin splitting in two-dimensional transition-metal dichalcogenide semiconductors journal, October 2011

Optical Spectrum of MoS 2 : Many-Body Effects and Diversity of Exciton States journal, November 2013

Valley Splitting and Polarization by the Zeeman Effect in Monolayer MoSe 2 journal, December 2014

Resonant internal quantum transitions and femtosecond radiative decay of excitons in monolayer WSe2 journal, July 2015

Probing excitonic dark states in single-layer tungsten disulphide journal, August 2014

Atomically Thin MoS2 A New Direct-Gap Semiconductor journal, September 2010

Exciton valley dynamics probed by Kerr rotation in WSe 2 monolayers journal, October 2014

WSe 2 Light-Emitting Tunneling Transistors with Enhanced Brightness at Room Temperature journal, November 2015

The valley Hall effect in MoS2 transistors journal, June 2014

Valley-selective circular dichroism of monolayer molybdenum disulphide journal, January 2012

Valley Zeeman effect in elementary optical excitations of monolayer WSe2 journal, January 2015

Observation of biexcitons in monolayer WSe2 journal, May 2015

Single photon emitters in exfoliated WSe2 structures journal, May 2015

Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS 2 journal, August 2014

Electron-hole excitations and optical spectra from first principles journal, August 2000

Valley depolarization due to intervalley and intravalley electron-hole exchange interactions in monolayer MoS 2 journal, May 2014

Probing dark excitons in atomically thin semiconductors via near-field coupling to surface plasmon polaritons journal, June 2017

Low-Frequency Raman Spectroscopy of Few-Layer 2H-SnS2 journal, July 2018

Evidence for line width and carrier screening effects on excitonic valley relaxation in 2D semiconductors journal, July 2018

The role of momentum-dark excitons in the elementary optical response of bilayer WSe2 journal, July 2018

Two-dimensional semiconductors in the regime of strong light-matter coupling journal, July 2018

Controlling valley splitting and polarization of dark- and bi-excitons in monolayer WS 2 by a tilted magnetic field journal, July 2019

Valley-selective chiral phonon replicas of dark excitons and trions in monolayer WS e 2 journal, October 2019

Two-dimensional semiconductors in the regime of strong light-matter coupling journal, July 2018

The role of momentum-dark excitons in the elementary optical response of bilayer WSe2 journal, July 2018

Evidence for line width and carrier screening effects on excitonic valley relaxation in 2D semiconductors journal, July 2018

Low-Frequency Raman Spectroscopy of Few-Layer 2H-SnS2 journal, July 2018

Controlling valley splitting and polarization of dark- and bi-excitons in monolayer WS 2 by a tilted magnetic field journal, July 2019

Valley-selective chiral phonon replicas of dark excitons and trions in monolayer WS e 2 journal, October 2019

Continuous Control and Enhancement of Excitonic Valley Polarization in Monolayer WSe 2 by Electrostatic Doping journal, March 2019

Tailoring MoS 2 Valley-Polarized Photoluminescence with Super Chiral Near-Field journal, July 2018

Theory and Ab Initio Calculation of Optically Excited States—Recent Advances in 2D Materials journal, December 2019

Inorganic 2D Luminescent Materials: Structure, Luminescence Modulation, and Applications journal, October 2019

Ultra‐Long Lifetimes of Single Quantum Emitters in Monolayer WSe 2 /hBN Heterostructures journal, April 2019

Dark‐Exciton‐Mediated Fano Resonance from a Single Gold Nanostructure on Monolayer WS 2 at Room Temperature journal, June 2019

Light Sources and Photodetectors Enabled by 2D Semiconductors journal, May 2018

Environmental engineering of transition metal dichalcogenide optoelectronics journal, June 2018

Probing dark excitons in atomically thin semiconductors via near-field coupling to surface plasmon polaritons journal, June 2017

Brightening the dark excitons journal, June 2017

Microsecond dark-exciton valley polarization memory in two-dimensional heterostructures journal, February 2018

Coulomb-bound four- and five-particle intervalley states in an atomically-thin semiconductor journal, September 2018

Revealing the biexciton and trion-exciton complexes in BN encapsulated WSe2 journal, September 2018

Efficient generation of neutral and charged biexcitons in encapsulated WSe2 monolayers journal, September 2018

Electroluminescence from multi-particle exciton complexes in transition metal dichalcogenide semiconductors journal, April 2019

The valley Zeeman effect in inter- and intra-valley trions in monolayer WSe2 journal, May 2019

Emerging photoluminescence from the dark-exciton phonon replica in monolayer WSe2 journal, June 2019

Out-of-plane orientation of luminescent excitons in two-dimensional indium selenide journal, September 2019

Long valley lifetime of dark excitons in single-layer WSe2 journal, September 2019

Revealing exciton masses and dielectric properties of monolayer semiconductors with high magnetic fields journal, September 2019

Valley phonons and exciton complexes in a monolayer semiconductor journal, January 2020

Disorder in van der Waals heterostructures of 2D materials journal, May 2019

Ultrafast dynamics in van der Waals heterostructures journal, November 2018

Light–valley interactions in 2D semiconductors journal, July 2018

Title: Magnetic brightening and control of dark excitons in monolayer WSe₂

Coupled Spin and Valley Physics in Monolayers of ${MoS}_{2}$ and Other Group-VI Dichalcogenides
journal, May 2012

Experimental Evidence for Dark Excitons in Monolayer ${WSe}_{2}$
journal, December 2015

Exciton fine structure and spin decoherence in monolayers of transition metal dichalcogenides
journal, May 2014

Breaking of Valley Degeneracy by Magnetic Field in Monolayer ${MoSe}_{2}$
journal, January 2015

Valley dynamics probed through charged and neutral exciton emission in monolayer ${WSe}_{2}$
journal, August 2014

Carrier and Polarization Dynamics in Monolayer ${MoS}_{2}$
journal, January 2014

Exciton exchange splitting in wide GaAs quantum wells
journal, December 1999

Splitting between bright and dark excitons in transition metal dichalcogenide monolayers
journal, March 2016

Spin-orbit engineering in transition metal dichalcogenide alloy monolayers
journal, December 2015

Optical generation of excitonic valley coherence in monolayer WSe2
journal, August 2013

Emerging Photoluminescence in Monolayer MoS₂
journal, April 2010

Spin and pseudospins in layered transition metal dichalcogenides
journal, April 2014

BerkeleyGW: A massively parallel computer package for the calculation of the quasiparticle and optical properties of materials and nanostructures
journal, June 2012

QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials
journal, September 2009

Optical Signatures of the Aharonov-Bohm Phase in Single-Walled Carbon Nanotubes
journal, May 2004

Valley- and spin-polarized Landau levels in monolayer WSe2
journal, October 2016

Direct measurement of exciton valley coherence in monolayer WSe2
journal, February 2016

k · p theory for two-dimensional transition metal dichalcogenide semiconductors
journal, April 2015

Spectroscopic study of dark excitons in ${In}_{x} {Ga}_{1 - x} As$ self-assembled quantum dots by a magnetic-field-induced symmetry breaking
journal, March 2000

Electron correlation in semiconductors and insulators: Band gaps and quasiparticle energies
journal, October 1986

Large spin splitting in the conduction band of transition metal dichalcogenide monolayers
journal, December 2013

Polarization analysis of excitons in monolayer and bilayer transition-metal dichalcogenides
journal, September 2015

Three-band tight-binding model for monolayers of group-VIB transition metal dichalcogenides
journal, August 2013

Giant spin-orbit-induced spin splitting in two-dimensional transition-metal dichalcogenide semiconductors
journal, October 2011

Optical Spectrum of ${MoS}_{2}$ : Many-Body Effects and Diversity of Exciton States
journal, November 2013

Valley Splitting and Polarization by the Zeeman Effect in Monolayer ${MoSe}_{2}$
journal, December 2014

Resonant internal quantum transitions and femtosecond radiative decay of excitons in monolayer WSe2
journal, July 2015

Probing excitonic dark states in single-layer tungsten disulphide
journal, August 2014

Atomically Thin ${MoS}_{2}$ A New Direct-Gap Semiconductor
journal, September 2010

Exciton valley dynamics probed by Kerr rotation in ${WSe}_{2}$ monolayers
journal, October 2014

WSe ₂ Light-Emitting Tunneling Transistors with Enhanced Brightness at Room Temperature
journal, November 2015

The valley Hall effect in MoS2 transistors
journal, June 2014

Valley-selective circular dichroism of monolayer molybdenum disulphide
journal, January 2012

Valley Zeeman effect in elementary optical excitations of monolayer WSe2
journal, January 2015

Observation of biexcitons in monolayer WSe2
journal, May 2015

Single photon emitters in exfoliated WSe2 structures
journal, May 2015

Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer ${WS}_{2}$
journal, August 2014

Electron-hole excitations and optical spectra from first principles
journal, August 2000

Valley depolarization due to intervalley and intravalley electron-hole exchange interactions in monolayer ${MoS}_{2}$
journal, May 2014

Probing dark excitons in atomically thin semiconductors via near-field coupling to surface plasmon polaritons
journal, June 2017

Low-Frequency Raman Spectroscopy of Few-Layer 2H-SnS2
journal, July 2018

Evidence for line width and carrier screening effects on excitonic valley relaxation in 2D semiconductors
journal, July 2018

The role of momentum-dark excitons in the elementary optical response of bilayer WSe2
journal, July 2018

Two-dimensional semiconductors in the regime of strong light-matter coupling
journal, July 2018

Controlling valley splitting and polarization of dark- and bi-excitons in monolayer WS 2 by a tilted magnetic field
journal, July 2019

Valley-selective chiral phonon replicas of dark excitons and trions in monolayer WS e 2
journal, October 2019

Two-dimensional semiconductors in the regime of strong light-matter coupling
journal, July 2018

The role of momentum-dark excitons in the elementary optical response of bilayer WSe2
journal, July 2018

Evidence for line width and carrier screening effects on excitonic valley relaxation in 2D semiconductors
journal, July 2018

Low-Frequency Raman Spectroscopy of Few-Layer 2H-SnS2
journal, July 2018

Controlling valley splitting and polarization of dark- and bi-excitons in monolayer WS 2 by a tilted magnetic field
journal, July 2019

Valley-selective chiral phonon replicas of dark excitons and trions in monolayer WS e 2
journal, October 2019

Continuous Control and Enhancement of Excitonic Valley Polarization in Monolayer WSe ₂ by Electrostatic Doping
journal, March 2019

Tailoring MoS ₂ Valley-Polarized Photoluminescence with Super Chiral Near-Field
journal, July 2018

Theory and Ab Initio Calculation of Optically Excited States—Recent Advances in 2D Materials
journal, December 2019

Inorganic 2D Luminescent Materials: Structure, Luminescence Modulation, and Applications
journal, October 2019

Ultra‐Long Lifetimes of Single Quantum Emitters in Monolayer WSe ₂ /hBN Heterostructures
journal, April 2019

Dark‐Exciton‐Mediated Fano Resonance from a Single Gold Nanostructure on Monolayer WS ₂ at Room Temperature
journal, June 2019

Light Sources and Photodetectors Enabled by 2D Semiconductors
journal, May 2018

Environmental engineering of transition metal dichalcogenide optoelectronics
journal, June 2018

Probing dark excitons in atomically thin semiconductors via near-field coupling to surface plasmon polaritons
journal, June 2017

Brightening the dark excitons
journal, June 2017

Microsecond dark-exciton valley polarization memory in two-dimensional heterostructures
journal, February 2018

Coulomb-bound four- and five-particle intervalley states in an atomically-thin semiconductor
journal, September 2018

Revealing the biexciton and trion-exciton complexes in BN encapsulated WSe2
journal, September 2018

Efficient generation of neutral and charged biexcitons in encapsulated WSe2 monolayers
journal, September 2018

Electroluminescence from multi-particle exciton complexes in transition metal dichalcogenide semiconductors
journal, April 2019

The valley Zeeman effect in inter- and intra-valley trions in monolayer WSe2
journal, May 2019

Emerging photoluminescence from the dark-exciton phonon replica in monolayer WSe2
journal, June 2019

Out-of-plane orientation of luminescent excitons in two-dimensional indium selenide
journal, September 2019

Long valley lifetime of dark excitons in single-layer WSe2
journal, September 2019

Revealing exciton masses and dielectric properties of monolayer semiconductors with high magnetic fields
journal, September 2019

Valley phonons and exciton complexes in a monolayer semiconductor
journal, January 2020

Disorder in van der Waals heterostructures of 2D materials
journal, May 2019

Ultrafast dynamics in van der Waals heterostructures
journal, November 2018

Light–valley interactions in 2D semiconductors
journal, July 2018

Exciton Relaxation Cascade in two-dimensional Transition Metal Dichalcogenides
journal, May 2018

Dark-exciton valley dynamics in transition metal dichalcogenide alloy monolayers
journal, March 2019

Exciton physics and device application of two-dimensional transition metal dichalcogenide semiconductors
journal, September 2018