Excitonic linewidth approaching the homogeneous limit in MoS2-based van der Waals heterostructures

@article{Cadiz2017ExcitonicLA,
  title={Excitonic linewidth approaching the homogeneous limit in MoS2-based van der Waals heterostructures},
  author={Fabian Cadiz and Emmanuel Courtade and Cedric Robert and G. Wang and Y. Shen and Hui Cai and Takashi Taniguchi and K. Watanabe and Helene Carr{\`e}re and D. Lagarde and Marco Manca and Thierry Amand and P. Renucci and Sefaattin Tongay and Xavier Marie and Bernhard Urbaszek},
  journal={Physical Review X},
  year={2017},
  volume={7},
  pages={021026}
}
The strong light-matter interaction and the valley selective optical selection rules make monolayer (ML) MoS[subscript 2] an exciting 2D material for fundamental physics and optoelectronics applications. But, so far, optical transition linewidths even at low temperature are typically as large as a few tens of meV and contain homogeneous and inhomogeneous contributions. This prevented in-depth studies, in contrast to the better-characterized ML materials MoSe[subscript 2] and WSe[subscript 2… Expand

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References

SHOWING 1-10 OF 171 REFERENCES
Intrinsic homogeneous linewidth and broadening mechanisms of excitons in monolayer transition metal dichalcogenides
TLDR
The key insights reported here—strong many-body effects and intrinsically rapid radiative recombination—are expected to be ubiquitous in atomically thin semiconductors. Expand
Resonant internal quantum transitions and femtosecond radiative decay of excitons in monolayer WSe2.
Atomically thin two-dimensional crystals have revolutionized materials science. In particular, monolayer transition metal dichalcogenides promise novel optoelectronic applications, owing to theirExpand
Exciton diamagnetic shifts and valley Zeeman effects in monolayer WS2 and MoS2 to 65 Tesla
TLDR
Low-temperature polarized reflection spectroscopy of atomically thin WS2 and MoS2 in high magnetic fields to 65 T is reported, thereby quantifying the valley Zeeman effect in monolayer transition-metal disulphides. Expand
Exciton–polaritons in van der Waals heterostructures embedded in tunable microcavities
TLDR
The results pave the way for room-temperature polaritonic devices based on multiple-quantum-well van der Waals heterostructures, where polariton condensation and electrical polariton injection through the incorporation of graphene contacts may be realized. Expand
Enabling valley selective exciton scattering in monolayer WSe2 through upconversion
TLDR
It is shown that scattering between B- Excitons and A-excitons preferably happens within the same valley in momentum space, which leads to power dependent, negative polarization of the hot B-exciton emission. Expand
Excitonic linewidth and coherence lifetime in monolayer transition metal dichalcogenides
TLDR
It is shown that the excitonic coherence lifetime is determined by phonon-induced intravalley scattering and intervalley scattering into dark exciton states, and in particular, in WS2, exciton relaxation processes involving phonon emission into lower-lying dark states that are operative at all temperatures. Expand
Well separated trion and neutral excitons on superacid treated MoS2 monolayers
Developments in optoelectronics and spin-optronics based on transition metal dichalcogenide monolayers (MLs) need materials with efficient optical emission and well-defined transition energies. InExpand
Valley- and spin-polarized Landau levels in monolayer WSe2.
TLDR
The observation of fully valley- and spin-polarized LLs in high-quality WSe2 monolayers achieved by exploiting a van der Waals heterostructure device platform is reported. Expand
Magneto-optics in transition metal diselenide monolayers
We perform photoluminescence experiments at 4K on two different transition metal diselenide monolayers, namely MoSe2 and WSe2 in magnetic fields $B_z$ up to 9T applied perpendicular to the sampleExpand
Optical Coherence in Atomic-Monolayer Transition-Metal Dichalcogenides Limited by Electron-Phonon Interactions.
We systematically investigate the excitonic dephasing of three representative transition-metal dichalcogenides, namely, MoS_{2}, MoSe_{2}, and WSe_{2} atomic monolayer thick and bulk crystals, inExpand
...
1
2
3
4
5
...