The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation

Ruppert, Claudia; Chernikov, Alexey; Hill, Heather M.; Rigosi, Albert F.; Heinz, Tony F.

doi:10.1021/acs.nanolett.6b03513

Title: The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS₂ after Ultrafast Excitation

Abstract

We study transient changes of the optical response of WS₂ monolayers by femtosecond broadband pump–probe spectroscopy. Time-dependent absorption spectra are analyzed by tracking the line width broadening, bleaching, and energy shift of the main exciton resonance as a function of time delay after the excitation. Two main sources for the pump-induced changes of the optical response are identified. Specifically, we find an interplay between modifications induced by many-body interactions from photoexcited carriers and by the subsequent transfer of the excitation to the phonon system followed by cooling of the material through the heat transfer to the substrate.

Authors:

^[1]; Chernikov, Alexey ^[2]; Hill, Heather M. ^[3]; Rigosi, Albert F. ^[3]; Heinz, Tony F. ^[3]

Columbia Univ., New York, NY (United States). Dept. of Physics and Electrical Engineering; Technische Univ. of Dortmund (Germany). Dept. of Physics
Columbia Univ., New York, NY (United States). Dept. of Physics and Electrical Engineering; Univ. of Regensburg (Germany). Dept. of Physics
Columbia Univ., New York, NY (United States). Dept. of Physics and Electrical Engineering; Stanford Univ., CA (United States). Dept. of Applied Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States)

Publication Date:: Fri Jan 06 00:00:00 EST 2017

Research Org.:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Org.:: USDOE; German Research Foundation (DFG); National Science Foundation (NSF)

OSTI Identifier:: 1353103

Grant/Contract Number:: DGE-1069240; FA9550-14-1-0268; AC02-76SF00515

Resource Type:: Accepted Manuscript

Journal Name:: Nano Letters

Additional Journal Information:: Journal Volume: 17; Journal Issue: 2; Journal ID: ISSN 1530-6984

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; atomically thin 2D materials; ultrafast spectroscopy; carrier and phonon dynamics

Citation Formats


                    Ruppert, Claudia, Chernikov, Alexey, Hill, Heather M., Rigosi, Albert F., and Heinz, Tony F. The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation.  United States: N. p., 2017. 
Web.  doi:10.1021/acs.nanolett.6b03513.

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                    Ruppert, Claudia, Chernikov, Alexey, Hill, Heather M., Rigosi, Albert F., & Heinz, Tony F. The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation.  United States.  https://doi.org/10.1021/acs.nanolett.6b03513

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                    Ruppert, Claudia, Chernikov, Alexey, Hill, Heather M., Rigosi, Albert F., and Heinz, Tony F. Fri .  
"The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation".  United States.  https://doi.org/10.1021/acs.nanolett.6b03513.  https://www.osti.gov/servlets/purl/1353103.

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@article{osti_1353103,

  title        = {The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation},

  author       = {Ruppert, Claudia and Chernikov, Alexey and Hill, Heather M. and Rigosi, Albert F. and Heinz, Tony F.},

  abstractNote = {We study transient changes of the optical response of WS2 monolayers by femtosecond broadband pump–probe spectroscopy. Time-dependent absorption spectra are analyzed by tracking the line width broadening, bleaching, and energy shift of the main exciton resonance as a function of time delay after the excitation. Two main sources for the pump-induced changes of the optical response are identified. Specifically, we find an interplay between modifications induced by many-body interactions from photoexcited carriers and by the subsequent transfer of the excitation to the phonon system followed by cooling of the material through the heat transfer to the substrate.},

  doi          = {10.1021/acs.nanolett.6b03513},

  journal      = {Nano Letters},

  number       = 2,

  volume       = 17,

  place        = {United States},

  year         = {Fri Jan 06 00:00:00 EST 2017},

  month        = {Fri Jan 06 00:00:00 EST 2017}

}

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Layered transition metal dichalcogenides exhibit the emergence of a direct bandgap at the monolayer limit along with pronounced excitonic effects. In these materials, interaction with phonons is the dominant mechanism that limits the exciton coherence lifetime. Exciton-phonon interaction also facilitates energy and momentum relaxation, and influences exciton diffusion under most experimental conditions. However, the fundamental changes in the exciton–phonon interaction are not well understood as the material undergoes the transition from a direct to an indirect bandgap semiconductor. Here, we address this question through optical spectroscopy and microscopic theory. In the experiment, we study room-temperature statistics of the exciton linemore »« less
Cited by 41
https://doi.org/10.1021/acs.nanolett.8b01793

Full Text Available
Coupled valence carrier and core-exciton dynamics in WS₂ probed by few-femtosecond extreme ultraviolet transient absorption spectroscopy

Journal Article Chang, Hung-Tzu ; Guggenmos, Alexander ; Chen, Christopher T. ; ... - Physical Review B

Few-femtosecond extreme ultraviolet (XUV) transient absorption spectroscopy, performed with optical 500-1000-nm supercontinuum and broadband XUV pulses (30-50 eV), simultaneously probes dynamics of photoexcited carriers in WS₂ at the W O₃ edge (37-45 eV) and carrier-induced modifications of core-exciton absorption at the WN_6,7 edge (32-37 eV). Access to continuous core-to-conduction-band absorption features and discrete core-exciton transitions in the same XUV spectral region in a semiconductor provides a means to investigate the effect of carrier excitation on core-exciton dynamics. The core-level transient absorption spectra, measured with either pulse arriving first to explore both core-level and valence carrier dynamics, reveal that core-exciton transitionsmore »« less
https://doi.org/10.1103/physrevb.104.064309

Full Text Available
Observation of Excitonic Rydberg States in Monolayer MoS₂ and WS₂ by Photoluminescence Excitation Spectroscopy

Journal Article Hill, Heather M. ; Rigosi, Albert F. ; Roquelet, Cyrielle ; ... - Nano Letters

Here, we have identified excited exciton states in monolayers of MoS₂ and WS₂ supported on fused silica by means of photoluminescence excitation spectroscopy. In monolayer WS₂, the positions of the excited A exciton states imply an exciton binding energy of 0.32 eV. In monolayer MoS₂, excited exciton transitions are observed at energies of 2.24 and 2.34 eV. Assigning these states to the B exciton Rydberg series yields an exciton binding energy of 0.44 eV.
Cited by 280
https://doi.org/10.1021/nl504868p

Full Text Available
Ultrafast Exciton Dissociation at the 2D-WS₂ Monolayer/Perovskite Interface

Journal Article Bauer, Joshua ; Quintanar, Leo Scott ; Wang, Kai ; ... - Journal of Physical Chemistry. C

For an excitonic photovoltaic (PV) device to perform efficiently, photogenerated excitons in the charge donor need to be dissociated through charge transfer (CT) to the acceptor rapidly after their photogeneration and remain separated for a longer time to allow the collection of charges. To improve the efficiency of these steps, several combinations of materials have been examined. Due to their excellent optical properties, two-dimensional transition-metal dichalcogenides (2D-TMDs) have recently been explored. Another promising class of materials to platform efficient PVs is organic–inorganic perovskites. Here, we report on the ultrafast exciton dissociation through electron transfer from a 2D tungsten disulfide (WS₂)more »« less
Cited by 15
https://doi.org/10.1021/acs.jpcc.8b08183

Full Text Available
Ultrafast X-ray Transient Absorption Spectroscopy of Gas-Phase Photochemical Reactions: A New Universal Probe of Photoinduced Molecular Dynamics

Journal Article Bhattacherjee, Aditi ; Leone, Stephen R. - Accounts of Chemical Research

Time-resolved spectroscopic investigations of light-induced chemical reactions with universal detection capitalize recently on single-photon molecular probing using laser pulses in the extreme ultraviolet or X-ray regimes. Direct and simultaneous mappings of the time-evolving populations of ground-state reactants, Franck-Condon (FC) and transition state regions, excited-state intermediates and conical intersections (CI), and photoproducts in photochemical reactions utilize probe pulses that are broadband and energy-tunable. The limits on temporal resolution are set by the transit- or dwell-time of the photoexcited molecules at specific locations on the potential energy surface, typically ranging from a few femtoseconds to several hundred picoseconds. Femtosecond high-harmonic generation (HHG)more »« less
Cited by 34
https://doi.org/10.1021/acs.accounts.8b00462

Full Text Available

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Title: The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS2 after Ultrafast Excitation

Abstract

Citation Formats

Two-dimensional atomic crystals journal, July 2005

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

Emerging Photoluminescence in Monolayer MoS2 journal, April 2010

Progress, Challenges, and Opportunities in Two-Dimensional Materials Beyond Graphene journal, March 2013

The chemistry of two-dimensional layered transition metal dichalcogenide nanosheets journal, April 2013

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

Two-dimensional material nanophotonics journal, November 2014

Valley excitons in two-dimensional semiconductors journal, December 2014

Photonics and optoelectronics of 2D semiconductor transition metal dichalcogenides journal, March 2016

Low-temperature photocarrier dynamics in monolayer MoS 2 journal, September 2011

Ultrafast and spatially resolved studies of charge carriers in atomically thin molybdenum disulfide journal, July 2012

Charge carrier dynamics in bulk MoS 2 crystal studied by transient absorption microscopy journal, April 2013

Exciton Dynamics in Suspended Monolayer and Few-Layer MoS 2 2D Crystals journal, January 2013

Transient Absorption Microscopy of Monolayer and Bulk WSe 2 journal, February 2014

Ultrafast Dynamics of Defect-Assisted Electron–Hole Recombination in Monolayer MoS 2 journal, December 2014

Intrinsic homogeneous linewidth and broadening mechanisms of excitons in monolayer transition metal dichalcogenides journal, September 2015

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

Exciton dynamics in atomically thin MoS 2 : Interexcitonic interaction and broadening kinetics journal, August 2013

Exciton-exciton annihilation in MoSe 2 monolayers journal, March 2014

Nonlinear photoluminescence in atomically thin layered WSe 2 arising from diffusion-assisted exciton-exciton annihilation journal, October 2014

Observation of Rapid Exciton–Exciton Annihilation in Monolayer Molybdenum Disulfide journal, September 2014

Coherent Electronic Coupling in Atomically Thin MoSe 2 journal, May 2014

Valley-selective optical Stark effect in monolayer WS2 journal, December 2014

Ultrafast generation of pseudo-magnetic field for valley excitons in WSe 2 monolayers journal, December 2014

Influence of Excited Carriers on the Optical and Electronic Properties of MoS 2 journal, June 2014

Electrical Tuning of Exciton Binding Energies in Monolayer WS 2 journal, September 2015

Photo-Induced Bandgap Renormalization Governs the Ultrafast Response of Single-Layer MoS 2 journal, December 2015

Ultrafast Band Structure Control of a Two-Dimensional Heterostructure journal, May 2016

Population inversion and giant bandgap renormalization in atomically thin WS2 layers journal, June 2015

Dynamic Structural Response and Deformations of Monolayer MoS 2 Visualized by Femtosecond Electron Diffraction journal, September 2015

Valley Carrier Dynamics in Monolayer Molybdenum Disulfide from Helicity-Resolved Ultrafast Pump–Probe Spectroscopy journal, November 2013

Many-Body Effects in Valleytronics: Direct Measurement of Valley Lifetimes in Single-Layer MoS 2 journal, December 2013

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

Ultrafast valley relaxation dynamics in monolayer MoS 2 probed by nonequilibrium optical techniques journal, December 2015

Long-lived nanosecond spin relaxation and spin coherence of electrons in monolayer MoS2 and WS2 journal, August 2015

Valley-polarized exciton dynamics in a 2D semiconductor heterostructure journal, February 2016

Ultrafast Coulomb-Induced Intervalley Coupling in Atomically Thin WS 2 journal, April 2016

Measurement of the optical dielectric function of monolayer transition-metal dichalcogenides: MoS 2 , Mo S e 2 , WS 2 , and WS e 2 journal, November 2014

Evolution of Electronic Structure in Atomically Thin Sheets of WS 2 and WSe 2 journal, December 2012

Optical signature of symmetry variations and spin-valley coupling in atomically thin tungsten dichalcogenides journal, April 2013

Optical control of charged exciton states in tungsten disulfide journal, May 2015

Tightly bound trions in monolayer MoS2 journal, December 2012

Electrical control of neutral and charged excitons in a monolayer semiconductor journal, February 2013

Ultrafast Carrier Thermalization and Cooling Dynamics in Few-Layer MoS 2 journal, October 2014

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

Exciton Radiative Lifetimes in Two-Dimensional Transition Metal Dichalcogenides journal, March 2015

Radiative lifetimes of excitons and trions in monolayers of the metal dichalcogenide MoS 2 journal, January 2016

Near-unity photoluminescence quantum yield in MoS2 journal, November 2015

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

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

Exciton band structure in layered MoSe 2 : from a monolayer to the bulk limit journal, January 2015

Lattice vibrational modes and phonon thermal conductivity of monolayer MoS 2 journal, January 2014

Spectroscopic Determination of Phonon Lifetimes in Rhenium-Doped MoS 2 Nanoparticles journal, May 2013

Origin of Indirect Optical Transitions in Few-Layer MoS 2 , WS 2 , and WSe 2 journal, October 2013

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

Growth and Optical Properties of High-Quality Monolayer WS 2 on Graphite journal, February 2015

Excitonic linewidth and coherence lifetime in monolayer transition metal dichalcogenides journal, November 2016

Calorimetric measurements of the low-temperature heat capacity, standard molar enthalpy of formation at 298.15 K, and high-temperature molar enthalpy increments relative to 298.15 K of tungsten disulfide (WS2), and the thermodynamic properties to 1500 K journal, January 1984

Measurement of the thermal conductance of the graphene/SiO2 interface journal, November 2010

Role of thermal boundary resistance on the heat flow in carbon-nanotube composites journal, June 2004

Determination of interfacial thermal resistance at the nanoscale journal, May 2011

Measurement of the anisotropic thermal conductivity of molybdenum disulfide by the time-resolved magneto-optic Kerr effect journal, December 2014

Measurement of Lateral and Interfacial Thermal Conductivity of Single- and Bilayer MoS 2 and MoSe 2 Using Refined Optothermal Raman Technique journal, November 2015

Coupled exciton-trion spin dynamics in a MoSe 2 monolayer journal, September 2018

Ultrafast carrier dynamics in colloidal WS 2 nanosheets obtained through a hot injection synthesis journal, October 2019

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

Photo-induced excitonic structure renormalization and broadband absorption in monolayer tungsten disulphide journal, January 2018

Study on photoelectric characteristics of monolayer WS 2 films journal, January 2019

Synthesis of Large-Scale Single-Crystalline Monolayer WS2 Using a Semi-Sealed Method journal, February 2018

Physics of excitons and their transport in two dimensional transition metal dichalcogenide semiconductors journal, January 2019

Contact morphology and revisited photocurrent dynamics in monolayer MoS2 journal, November 2017

Transient SHG Imaging on Ultrafast Carrier Dynamics of MoS 2 Nanosheets journal, February 2018

Charge trapping and coalescence dynamics in few layer MoS 2 journal, October 2017

Resonant optical Stark effect in monolayer WS2 journal, December 2019

Transient photoconductivity and free carrier dynamics in a monolayer WS 2 probed by time resolved Terahertz spectroscopy journal, April 2019

Ultrafast nonequilibrium dynamics of strongly coupled resonances in the intrinsic cavity of W S 2 nanotubes journal, October 2019

Cooperative inter- and intra-layer lattice dynamics of photoexcited multi-walled carbon nanotubes studied by ultrafast electron diffraction journal, January 2018

Title: The Role of Electronic and Phononic Excitation in the Optical Response of Monolayer WS₂ after Ultrafast Excitation

Two-dimensional atomic crystals
journal, July 2005

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

Emerging Photoluminescence in Monolayer MoS₂
journal, April 2010

Progress, Challenges, and Opportunities in Two-Dimensional Materials Beyond Graphene
journal, March 2013

The chemistry of two-dimensional layered transition metal dichalcogenide nanosheets
journal, April 2013

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

Two-dimensional material nanophotonics
journal, November 2014

Valley excitons in two-dimensional semiconductors
journal, December 2014

Photonics and optoelectronics of 2D semiconductor transition metal dichalcogenides
journal, March 2016

Low-temperature photocarrier dynamics in monolayer MoS ₂
journal, September 2011

Ultrafast and spatially resolved studies of charge carriers in atomically thin molybdenum disulfide
journal, July 2012

Charge carrier dynamics in bulk MoS ₂ crystal studied by transient absorption microscopy
journal, April 2013

Exciton Dynamics in Suspended Monolayer and Few-Layer MoS ₂ 2D Crystals
journal, January 2013

Transient Absorption Microscopy of Monolayer and Bulk WSe ₂
journal, February 2014

Ultrafast Dynamics of Defect-Assisted Electron–Hole Recombination in Monolayer MoS ₂
journal, December 2014

Intrinsic homogeneous linewidth and broadening mechanisms of excitons in monolayer transition metal dichalcogenides
journal, September 2015

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

Exciton dynamics in atomically thin MoS $_{2}$ : Interexcitonic interaction and broadening kinetics
journal, August 2013

Exciton-exciton annihilation in MoSe $_{2}$ monolayers
journal, March 2014

Nonlinear photoluminescence in atomically thin layered ${WSe}_{2}$ arising from diffusion-assisted exciton-exciton annihilation
journal, October 2014

Observation of Rapid Exciton–Exciton Annihilation in Monolayer Molybdenum Disulfide
journal, September 2014

Coherent Electronic Coupling in Atomically Thin ${MoSe}_{2}$
journal, May 2014

Valley-selective optical Stark effect in monolayer WS2
journal, December 2014

Ultrafast generation of pseudo-magnetic field for valley excitons in WSe ₂ monolayers
journal, December 2014

Influence of Excited Carriers on the Optical and Electronic Properties of MoS ₂
journal, June 2014

Electrical Tuning of Exciton Binding Energies in Monolayer ${WS}_{2}$
journal, September 2015

Photo-Induced Bandgap Renormalization Governs the Ultrafast Response of Single-Layer MoS ₂
journal, December 2015

Ultrafast Band Structure Control of a Two-Dimensional Heterostructure
journal, May 2016

Population inversion and giant bandgap renormalization in atomically thin WS2 layers
journal, June 2015

Dynamic Structural Response and Deformations of Monolayer MoS ₂ Visualized by Femtosecond Electron Diffraction
journal, September 2015

Valley Carrier Dynamics in Monolayer Molybdenum Disulfide from Helicity-Resolved Ultrafast Pump–Probe Spectroscopy
journal, November 2013

Many-Body Effects in Valleytronics: Direct Measurement of Valley Lifetimes in Single-Layer MoS ₂
journal, December 2013

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

Ultrafast valley relaxation dynamics in monolayer ${MoS}_{2}$ probed by nonequilibrium optical techniques
journal, December 2015

Long-lived nanosecond spin relaxation and spin coherence of electrons in monolayer MoS2 and WS2
journal, August 2015

Valley-polarized exciton dynamics in a 2D semiconductor heterostructure
journal, February 2016

Ultrafast Coulomb-Induced Intervalley Coupling in Atomically Thin WS ₂
journal, April 2016

Measurement of the optical dielectric function of monolayer transition-metal dichalcogenides: ${MoS}_{2}$ , $Mo S e_{2}$ , ${WS}_{2}$ , and $WS e_{2}$
journal, November 2014

Evolution of Electronic Structure in Atomically Thin Sheets of WS ₂ and WSe ₂
journal, December 2012

Optical signature of symmetry variations and spin-valley coupling in atomically thin tungsten dichalcogenides
journal, April 2013

Optical control of charged exciton states in tungsten disulfide
journal, May 2015

Tightly bound trions in monolayer MoS2
journal, December 2012

Electrical control of neutral and charged excitons in a monolayer semiconductor
journal, February 2013

Ultrafast Carrier Thermalization and Cooling Dynamics in Few-Layer MoS ₂
journal, October 2014

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

Exciton Radiative Lifetimes in Two-Dimensional Transition Metal Dichalcogenides
journal, March 2015

Radiative lifetimes of excitons and trions in monolayers of the metal dichalcogenide ${MoS}_{2}$
journal, January 2016

Near-unity photoluminescence quantum yield in MoS2
journal, November 2015

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

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

Exciton band structure in layered MoSe ₂ : from a monolayer to the bulk limit
journal, January 2015

Lattice vibrational modes and phonon thermal conductivity of monolayer MoS $_{2}$
journal, January 2014

Spectroscopic Determination of Phonon Lifetimes in Rhenium-Doped MoS ₂ Nanoparticles
journal, May 2013

Origin of Indirect Optical Transitions in Few-Layer MoS ₂ , WS ₂ , and WSe ₂
journal, October 2013

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

Growth and Optical Properties of High-Quality Monolayer WS ₂ on Graphite
journal, February 2015

Excitonic linewidth and coherence lifetime in monolayer transition metal dichalcogenides
journal, November 2016

Calorimetric measurements of the low-temperature heat capacity, standard molar enthalpy of formation at 298.15 K, and high-temperature molar enthalpy increments relative to 298.15 K of tungsten disulfide (WS2), and the thermodynamic properties to 1500 K
journal, January 1984

Measurement of the thermal conductance of the graphene/SiO2 interface
journal, November 2010

Role of thermal boundary resistance on the heat flow in carbon-nanotube composites
journal, June 2004

Determination of interfacial thermal resistance at the nanoscale
journal, May 2011

Measurement of the anisotropic thermal conductivity of molybdenum disulfide by the time-resolved magneto-optic Kerr effect
journal, December 2014

Measurement of Lateral and Interfacial Thermal Conductivity of Single- and Bilayer MoS ₂ and MoSe ₂ Using Refined Optothermal Raman Technique
journal, November 2015

Coupled exciton-trion spin dynamics in a MoSe ₂ monolayer
journal, September 2018

Ultrafast carrier dynamics in colloidal WS ₂ nanosheets obtained through a hot injection synthesis
journal, October 2019

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

Photo-induced excitonic structure renormalization and broadband absorption in monolayer tungsten disulphide
journal, January 2018

Study on photoelectric characteristics of monolayer WS ₂ films
journal, January 2019

Synthesis of Large-Scale Single-Crystalline Monolayer WS2 Using a Semi-Sealed Method
journal, February 2018

Physics of excitons and their transport in two dimensional transition metal dichalcogenide semiconductors
journal, January 2019

Contact morphology and revisited photocurrent dynamics in monolayer MoS2
journal, November 2017

Transient SHG Imaging on Ultrafast Carrier Dynamics of MoS 2 Nanosheets
journal, February 2018

Charge trapping and coalescence dynamics in few layer MoS ₂
journal, October 2017

Resonant optical Stark effect in monolayer WS2
journal, December 2019

Transient photoconductivity and free carrier dynamics in a monolayer WS ₂ probed by time resolved Terahertz spectroscopy
journal, April 2019

Ultrafast nonequilibrium dynamics of strongly coupled resonances in the intrinsic cavity of $W S_{2}$ nanotubes
journal, October 2019

Cooperative inter- and intra-layer lattice dynamics of photoexcited multi-walled carbon nanotubes studied by ultrafast electron diffraction
journal, January 2018

Defect-mediated phonon dynamics in TaS ₂ and WSe ₂
journal, July 2017

Wavelength-dependent nonlinear absorption and ultrafast dynamics process of WS ₂
journal, January 2019