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Title: Intrinsic homogeneous linewidth and broadening mechanisms of excitons in monolayer transition metal dichalcogenides

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms9315· OSTI ID:1441157
 [1];  [2];  [3];  [4];  [2];  [2];  [2];  [5];  [5];  [6];  [7];  [6];  [2]
  1. Univ. of Texas at Austin, Austin, TX (United States); National Institute of Standards & Technology, Boulder, CO (United States)
  2. Univ. of Texas at Austin, Austin, TX (United States)
  3. Feng Chia Univ., Taichung (Taiwan)
  4. King Abdullah Univ. of Science & Technology (KAUST), Thuwal (Saudi Arabia)
  5. Univ. of Washington, Seattle, WA (United States)
  6. Technische Univ. Berlin, Berlin (Germany)
  7. Chalmers Univ. of Technology, Gothenburg (Sweden)

In this paper, the band-edge optical response of transition metal dichalcogenides, an emerging class of atomically thin semiconductors, is dominated by tightly bound excitons localized at the corners of the Brillouin zone (valley excitons). A fundamental yet unknown property of valley excitons in these materials is the intrinsic homogeneous linewidth, which reflects irreversible quantum dissipation arising from system (exciton) and bath (vacuum and other quasiparticles) interactions and determines the timescale during which excitons can be coherently manipulated. Here we use optical two-dimensional Fourier transform spectroscopy to measure the exciton homogeneous linewidth in monolayer tungsten diselenide (WSe2). The homogeneous linewidth is found to be nearly two orders of magnitude narrower than the inhomogeneous width at low temperatures. We evaluate quantitatively the role of exciton–exciton and exciton–phonon interactions and population relaxation as linewidth broadening mechanisms. The key insights reported here—strong many-body effects and intrinsically rapid radiative recombination—are expected to be ubiquitous in atomically thin semiconductors.

Research Organization:
Univ. of Washington, Seattle, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0008145
OSTI ID:
1441157
Journal Information:
Nature Communications, Vol. 6, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 367 works
Citation information provided by
Web of Science

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Ultrafast Laser Spectroscopy of Two-Dimensional Materials Beyond Graphene journal December 2016
Continuous Control and Enhancement of Excitonic Valley Polarization in Monolayer WSe 2 by Electrostatic Doping journal March 2019
Experimental Evidence of Anisotropic and Stable Charged Excitons (Trions) in Atomically Thin 2D ReS 2 journal October 2019
Exciton-Plasmon Coupling and Electromagnetically Induced Transparency in Monolayer Semiconductors Hybridized with Ag Nanoparticles journal February 2016
Engineering Bandgaps of Monolayer MoS 2 and WS 2 on Fluoropolymer Substrates by Electrostatically Tuned Many-Body Effects journal May 2016
Multidimensional Coherent Spectroscopy of Semiconductors journal November 2018
Ultra‐Long Lifetimes of Single Quantum Emitters in Monolayer WSe 2 /hBN Heterostructures journal April 2019
Environmental engineering of transition metal dichalcogenide optoelectronics journal June 2018
Effect of Phonons on Valley Depolarization in Monolayer WSe2 journal July 2018
Excitonic linewidth and coherence lifetime in monolayer transition metal dichalcogenides journal November 2016
Enabling valley selective exciton scattering in monolayer WSe2 through upconversion journal April 2017
Valley-addressable polaritons in atomically thin semiconductors journal July 2017
Optical manipulation of valley pseudospin journal September 2016
Ultrafast quantum beats of anisotropic excitons in atomically thin ReS2 journal January 2018
Inverted valley polarization in optically excited transition metal dichalcogenides journal March 2018
Giant optical nonlinearities from Rydberg excitons in semiconductor microcavities journal April 2018
Two-dimensional semiconductors in the regime of strong light-matter coupling journal July 2018
Evidence for line width and carrier screening effects on excitonic valley relaxation in 2D semiconductors journal July 2018
Many-body simulation of two-dimensional electronic spectroscopy of excitons and trions in monolayer transition metal dichalcogenides journal July 2019
Carrier multiplication in van der Waals layered transition metal dichalcogenides journal December 2019
Polarized resonant emission of monolayer WS2 coupled with plasmonic sawtooth nanoslit array journal February 2020
Exchange-driven intravalley mixing of excitons in monolayer transition metal dichalcogenides journal December 2018
Quantum interference in second-harmonic generation from monolayer WSe2 journal January 2019
Exciton Relaxation Cascade in two-dimensional Transition Metal Dichalcogenides journal May 2018
Study on photoelectric characteristics of monolayer WS 2 films journal January 2019
Realization of an all optical exciton-polariton router journal November 2015
Exciton valley dynamics in monolayer Mo 1-x W x Se 2 (x = 0, 0.5, 1) journal October 2017
The interplay between excitons and trions in a monolayer of MoSe 2 journal January 2018
Modulation of THz radiation via enhanced Dirac plasmon-dual phonon interaction journal December 2019
Advances in multi-dimensional coherent spectroscopy of semiconductor nanostructures journal May 2017
Dynamical screening in monolayer transition-metal dichalcogenides and its manifestations in the exciton spectrum journal March 2019
Nonequilibrium carrier dynamics in transition metal dichalcogenide semiconductors journal August 2016
Many-body effects in nonlinear optical responses of 2D layered semiconductors journal February 2017
Unconventional electroabsorption in monolayer MoS 2 journal January 2017
Approaching the intrinsic photoluminescence linewidth in transition metal dichalcogenide monolayers journal July 2017
Exciton broadening and band renormalization due to Dexter-like intervalley coupling journal February 2018
High optical quality of MoS 2 monolayers grown by chemical vapor deposition journal November 2019
Roadmap on finding chiral valleys: screening 2D materials for valleytronics journal June 2018
Excitonic magneto-optics in monolayer transition metal dichalcogenides: From nanoribbons to two-dimensional response journal July 2019
Theory of second-order excitonic nonlinearities in transition metal dichalcogenides journal September 2019
Valley trion dynamics in monolayer MoSe 2 journal December 2016
Complexes of dipolar excitons in layered quasi-two-dimensional nanostructures journal April 2018
Mapping of the dark exciton landscape in transition metal dichalcogenides journal July 2018
Fundamental exciton linewidth broadening in monolayer transition metal dichalcogenides journal February 2019
Layer degree of freedom for excitons in transition metal dichalcogenides journal April 2019
Enhanced screening and spectral diversity in many-body elastic scattering of excitons in two-dimensional hybrid metal-halide perovskites journal December 2019
Deconvolution of optical multidimensional coherent spectra journal June 2018
Room temperature nanocavity laser with interlayer excitons in 2D heterostructures journal April 2019
Broadband two-dimensional electronic spectroscopy in an actively phase stabilized pump-probe configuration journal January 2017
Chiral light-matter interactions using spin-valley states in transition metal dichalcogenides journal January 2019
Observation of 2D semiconductor P-type dark-exciton lifetime using two-photon ultrafast spectroscopy journal January 2019
Single-scan acquisition of multiple multidimensional spectra journal January 2019
Engineering Valley Polarization of Monolayer WS 2 : A Physical Doping Approach journal February 2019
Direct optical-structure correlation in atomically thin dichalcogenides and heterostructures journal January 2020
Valleytronics in 2D materials journal August 2016
Cascaded emission of single photons from the biexciton in monolayered WSe2 journal November 2016
Directional interlayer spin-valley transfer in two-dimensional heterostructures journal December 2016
Slow cooling and efficient extraction of C-exciton hot carriers in MoS2 monolayer journal January 2017
Direct measurement of exciton valley coherence in monolayer WSe2 journal February 2016
The valley Zeeman effect in inter- and intra-valley trions in monolayer WSe2 journal May 2019
Ultrafast dynamics in van der Waals heterostructures journal November 2018
Biexcitonic optical Stark effects in monolayer molybdenum diselenide journal July 2018
Direct exciton emission from atomically thin transition metal dichalcogenide heterostructures near the lifetime limit journal September 2017
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Enhancing functionalities of atomically thin semiconductors with plasmonic nanostructures journal March 2019
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Exciton Radiative Lifetime in Transition Metal Dichalcogenide Monolayers text January 2016
Nonequilibrium Carrier Dynamics in Transition Metal Dichalcogenide Semiconductors text January 2016
Two-dimensional Fröhlich interaction in transition-metal dichalcogenide monolayers: Theoretical modeling and first-principles calculations text January 2016
Probing Many-Body Interactions in Monolayer Transition-Metal Dichalcogenides text January 2016
Exciton-phonon relaxation bottleneck and radiative decay of thermal exciton reservoir in two-dimensional materials text January 2016
Many-body effects in nonlinear optical responses of 2D layered semiconductors text January 2016
Impact of environment on dynamics of exciton complexes in a WS$_2$ monolayer preprint January 2017
Exciton Relaxation Cascade in Two-dimensional Transition-metal dichalcogenides text January 2017
Complexes of dipolar excitons in layered quasi-two-dimensional nanostructures text January 2017
Dynamical screening in monolayer transition-metal dichalcogenides and its manifestations in the exciton spectrum text January 2018
Two-dimensional semiconductors in the regime of strong light-matter coupling text January 2018
Virtual trions in the photoluminescence of monolayer transition-metal dichalcogenides text January 2018
Fundamental exciton linewidth broadening in monolayer transition metal dichalcogenides text January 2019
Controlling excitons in an atomically thin membrane with a mirror text January 2019
Intrinsic Lifetime of Higher Excitonic States in Tungsten Diselenide Monolayers text January 2019
Chiral light-matter interactions using spin-valley states in transition metal dichalcogenides text January 2019
Enhanced screening and spectral diversity in many-body elastic scattering of excitons in two-dimensional hybrid metal-halide perovskites text January 2019
Excitonic magneto-optics in monolayer transition metal dichalcogenides: From nanoribbons to two-dimensional response text January 2019
Room temperature nanocavity laser with interlayer excitons in 2D heterostructures preprint January 2019
Mapping of the dark exciton landscape in transition metal dichalcogenides text January 2018
Enabling valley selective exciton scattering in monolayer WSe$_2$ through upconversion text January 2017
Encapsulation Narrows Excitonic Homogeneous Linewidth of Exfoliated MoSe$_2$ Monolayer text January 2018

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