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Colloquium: Excitons in atomically thin transition metal dichalcogenides

Journal Article · · Reviews of Modern Physics
 [1];  [2];  [3];  [4];  [5];  [5];  [5]
  1. Univ. of Toulouse (France). INSA-CNRS-UPS, LPCNO; Univ. of Cambridge (United Kingdom). G. W. Cambridge Graphene Centre
  2. Univ. of Regensburg (Germany). Dept. of Physics
  3. Ioffe Inst., St. Petersburg (Russian Federation)
  4. Stanford Univ., CA (United States). Dept. of Applied Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. Univ. of Toulouse (France). INSA-CNRS-UPS, LPCNO

Atomically thin materials such as graphene and monolayer transition metal dichalcogenides (TMDs) exhibit remarkable physical properties resulting from their reduced dimensionality and crystal symmetry. The family of semiconducting transition metal dichalcogenides is an especially promising platform for fundamental studies of two-dimensional (2D) systems, with potential applications in optoelectronics and valleytronics due to their direct band gap in the monolayer limit and highly efficient light-matter coupling. A crystal lattice with broken inversion symmetry combined with strong spin-orbit interactions leads to a unique combination of the spin and valley degrees of freedom. In addition, the 2D character of the monolayers and weak dielectric screening from the environment yield a significant enhancement of the Coulomb interaction. The resulting formation of bound electron-hole pairs, or excitons, dominates the optical and spin properties of the material. In this article, recent progress in understanding of the excitonic properties in monolayer TMDs is reviewed and future challenges are laid out. Discussed are the consequences of the strong direct and exchange Coulomb interaction, exciton light-matter coupling, and influence of finite carrier and electron-hole pair densities on the exciton properties in TMDs. Finally, the impact on valley polarization is described and the tuning of the energies and polarization observed in applied electric and magnetic fields is summarized.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; European Research Council (ERC); German Research Foundation (DFG); Grant of the President of the Russian Federation; Russian Foundation for Basic Research; Gordon and Betty Moore Foundation; National Research Agency of France (ANR); Univ. Inst. of France (IUF); LIA CNRS-Ioffe ILNACS
OSTI ID:
1435910
Journal Information:
Reviews of Modern Physics, Journal Name: Reviews of Modern Physics Journal Issue: 2 Vol. 90; ISSN RMPHAT; ISSN 0034-6861
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Exciton band structure in layered MoSe2: from a monolayer to the bulk limit text January 2015
Vibrational and optical properties of MoS$_2$: from monolayer to bulk text January 2016
Probing the influence of dielectric environment on excitons in monolayer WSe2: Insight from high magnetic fields text January 2016
Electric Field Effect in Atomically Thin Carbon Films text January 2004
Low-temperature photocarrier dynamics in monolayer MoS2 text January 2011
Resonant internal Quantum transitions and femtosecond radiative decay of excitons in monolayer WSe2 text January 2015
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Valley polarization of exciton–polaritons in monolayer WSe 2 in a tunable microcavity journal January 2019
Intrinsic lifetime of higher excitonic states in tungsten diselenide monolayers journal January 2019
Negative effective excitonic diffusion in monolayer transition metal dichalcogenides journal January 2020
The magnetism of 1T-MX 2 (M = Zr, Hf; X = S, Se) monolayers by hole doping journal January 2019
Physics of excitons and their transport in two dimensional transition metal dichalcogenide semiconductors journal January 2019
Diabatic Hamiltonian construction in van der Waals heterostructure complexes journal January 2019
Spectrally narrow exciton luminescence from monolayer MoS 2 and MoSe 2 exfoliated onto epitaxially grown hexagonal BN journal July 2018
Anomalous energy shift of laterally confined two-dimensional excitons journal July 2018
Substrate-induced shifts and screening in the fluorescence spectra of supramolecular adsorbed organic monolayers journal August 2018
Multiple parameter dynamic photoresponse microscopy for data-intensive optoelectronic measurements of van der Waals heterostructures journal February 2019
Supercontinuum second harmonic generation spectroscopy of atomically thin semiconductors journal August 2019
Geometric band properties in strained monolayer transition metal dichalcogenides using simple band structures journal September 2019
Time- and momentum-resolved photoemission studies using time-of-flight momentum microscopy at a free-electron laser journal January 2020
Rich diversity of crystallographic phase formation in 2D Re x Mo 1 –  x S 2 ( x  < 0.5) alloy journal December 2019
Perfect absorption in transition metal dichalcogenides-based dielectric grating journal August 2018
Signatures of self-trapping of trions in monolayer MoS 2 journal September 2018
Dynamical screening in monolayer transition-metal dichalcogenides and its manifestations in the exciton spectrum journal March 2019
Optical absorption of single-layer hexagonal boron nitride in the ultraviolet journal October 2019
Recent progress in 2D group IV–IV monochalcogenides: synthesis, properties and applications journal April 2019
Enhanced excitation and emission from 2D transition metal dichalcogenides with all-dielectric nanoantennas journal April 2019
Inhomogeneous photocarrier dynamics and transport in monolayer MoS 2 by ultrafast microscopy journal September 2019
Band-bending induced by charged defects and edges of atomically thin transition metal dichalcogenide films journal June 2018
Zeeman spectroscopy of excitons and hybridization of electronic states in few-layer WSe 2 , MoSe 2 and MoTe 2 journal November 2018
Ultrafast time-resolved investigations of excitons and biexcitons at room temperature in layered WS 2 journal November 2018
Dielectric impact on exciton binding energy and quasiparticle bandgap in monolayer WS 2 and WSe 2 journal March 2019
Fine structure of K-excitons in multilayers of transition metal dichalcogenides journal February 2019
Photo-induced exfoliation of monolayer transition metal dichalcogenide semiconductors journal September 2019
Exciton-polaritons in multilayer WSe 2 in a planar microcavity journal October 2019
Theory of coherent pump–probe spectroscopy in monolayer transition metal dichalcogenides journal December 2019
Magnetic field mixing and splitting of bright and dark excitons in monolayer MoSe 2 journal November 2019
New insights in the lattice dynamics of monolayers, bilayers, and trilayers of WSe 2 and unambiguous determination of few-layer-flakes’ thickness journal January 2020
Disentangling the effects of doping, strain and disorder in monolayer WS 2 by optical spectroscopy journal January 2020
Magneto-optical Kerr effect in spin split two-dimensional massive Dirac materials journal January 2020
Quantum-enhanced tunable spin-valley dependent excitonic second harmonic generation in molybdenum disulfide quantum dots journal November 2019
Control of the Exciton Radiative Lifetime in van der Waals Heterostructures journal August 2019
Excited-State Trions in Monolayer WS 2 journal October 2019
Phonon wind and drag of excitons in monolayer semiconductors journal July 2019
Charged excitons in two-dimensional transition metal dichalcogenides: Semiclassical calculation of Berry curvature effects journal September 2019
Exciton states and absorption spectra in freestanding monolayer transition metal dichalcogenides: A variationally optimized diagonalization method journal September 2019
Quantum anomalous valley Hall effect for bosons journal September 2019
Exploration of the bright and dark exciton landscape and fine structure of MoS 2 using G 0 W 0 -BSE journal September 2019
Exciton routing in the heterostructure of a transition metal dichalcogenide monolayer on a paraelectric substrate journal October 2019
Theory of exciton dynamics in time-resolved ARPES: Intra- and intervalley scattering in two-dimensional semiconductors journal November 2019
Triple sum frequency pump-probe spectroscopy of transition metal dichalcogenides journal December 2019
Hot exciton transport in WS e 2 monolayers journal December 2019
Excitons in phosphorene: A semi-analytical perturbative approach journal January 2020
Coherent and incoherent coupling dynamics in a two-dimensional atomic crystal embedded in a plasmon-induced magnetic resonator journal January 2020
Excitonic magneto-optical Kerr effect in two-dimensional transition metal dichalcogenides induced by spin proximity journal January 2020
Complexes of dipolar excitons in layered quasi-two-dimensional nanostructures journal April 2018
Exciton-polarons in doped semiconductors in a strong magnetic field journal June 2018
Observation of exciton-phonon coupling in MoSe 2 monolayers journal July 2018
Mie excitons: Understanding strong coupling in dielectric nanoparticles journal October 2018
Two-photon absorption in two-dimensional materials: The case of hexagonal boron nitride journal October 2018
Photoluminescence properties of the entire excitonic series in Cu 2 O journal November 2018
Crossover from trion-hole complex to exciton-polaron in n -doped two-dimensional semiconductor quantum wells journal December 2018
Interlayer hybridization and moiré superlattice minibands for electrons and excitons in heterobilayers of transition-metal dichalcogenides journal March 2019
Magnetophotoluminescence of exciton Rydberg states in monolayer WS e 2 journal May 2019
Bright Luminescence from Indirect and Strongly Bound Excitons in h-BN journal February 2019
Virtual Trions in the Photoluminescence of Monolayer Transition-Metal Dichalcogenides journal May 2019
Gate Tunable Dark Trions in Monolayer WSe 2 journal July 2019
Scanning Tunneling Microscope-Induced Excitonic Luminescence of a Two-Dimensional Semiconductor journal July 2019
Probing and Manipulating Valley Coherence of Dark Excitons in Monolayer WSe 2 journal August 2019
Microscopic description of exciton-polaritons in microcavities journal November 2019
Exciton States in Monolayer MoSe 2 and MoTe 2 Probed by Upconversion Spectroscopy journal September 2018
Giant gate-tunable bandgap renormalization and excitonic effects in a 2D semiconductor journal July 2019
Strain dependence of photoluminescence and circular dichroism in transition metal dichalcogenides: a k · p analysis journal January 2018
Van der Waals materials integrated nanophotonic devices [Invited] journal January 2019
Enhancing functionalities of atomically thin semiconductors with plasmonic nanostructures journal March 2019
Scalable photonic sources using two-dimensional lead halide perovskite superlattices text January 2020
Complexes of dipolar excitons in layered quasi-two-dimensional nanostructures text January 2017
Two-dimensional semiconductors in the regime of strong light-matter coupling text January 2018
Observation of bosonic condensation in a hybrid monolayer MoSe2-GaAs microcavity text January 2018
Tuning carrier concentration in a superacid treated MoS$_2$ monolayer text January 2018
Valley polarization of exciton-polaritons in monolayer WSe2 in a tunable microcavity text January 2018
Multiple Parameter Dynamic Photoresponse Microscopy for data-intensive optoelectronic measurements of van der Waals heterostructures text January 2018
Optical valley Hall effect for highly valley-coherent exciton-polaritons in an atomically thin semiconductor text January 2019
Optical fingerprint of bright and dark localized excitonic states in atomically thin 2D materials text January 2019
Diabatic Hamiltonian Construction in van der Waals heterostructure complexes preprint January 2019
Excitons in Phosphorene: A Semi-Analytical Perturbative Approach text January 2019
Exciton Diffusion and Halo Effects in Monolayer Semiconductors text January 2018
Strain-tunable orbital, spin-orbit, and optical properties of monolayer transition-metal dichalcogenides text January 2019
Dielectric Properties of NbxW1-xSe2 Alloys journal January 2019

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