Intrinsic homogeneous linewidth and broadening mechanisms of excitons in monolayer transition metal dichalcogenides
10.1038/ncomms9315
Crossref journal-article
Springer Science and Business Media LLC
Nature Communications (297)
Abstract

AbstractThe 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.

Bibliography

Moody, G., Kavir Dass, C., Hao, K., Chen, C.-H., Li, L.-J., Singh, A., Tran, K., Clark, G., Xu, X., Berghäuser, G., Malic, E., Knorr, A., & Li, X. (2015). Intrinsic homogeneous linewidth and broadening mechanisms of excitons in monolayer transition metal dichalcogenides. Nature Communications, 6(1).

Authors 13
  1. Galan Moody (first)
  2. Chandriker Kavir Dass (additional)
  3. Kai Hao (additional)
  4. Chang-Hsiao Chen (additional)
  5. Lain-Jong Li (additional)
  6. Akshay Singh (additional)
  7. Kha Tran (additional)
  8. Genevieve Clark (additional)
  9. Xiaodong Xu (additional)
  10. Gunnar Berghäuser (additional)
  11. Ermin Malic (additional)
  12. Andreas Knorr (additional)
  13. Xiaoqin Li (additional)
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Dates
Type When
Created 9 years, 11 months ago (Sept. 18, 2015, 7:07 a.m.)
Deposited 2 years, 7 months ago (Jan. 5, 2023, 5:48 a.m.)
Indexed 2 days, 1 hour ago (Aug. 21, 2025, 12:45 p.m.)
Issued 9 years, 11 months ago (Sept. 18, 2015)
Published 9 years, 11 months ago (Sept. 18, 2015)
Published Online 9 years, 11 months ago (Sept. 18, 2015)
Funders 0

None

@article{Moody_2015, title={Intrinsic homogeneous linewidth and broadening mechanisms of excitons in monolayer transition metal dichalcogenides}, volume={6}, ISSN={2041-1723}, url={http://dx.doi.org/10.1038/ncomms9315}, DOI={10.1038/ncomms9315}, number={1}, journal={Nature Communications}, publisher={Springer Science and Business Media LLC}, author={Moody, Galan and Kavir Dass, Chandriker and Hao, Kai and Chen, Chang-Hsiao and Li, Lain-Jong and Singh, Akshay and Tran, Kha and Clark, Genevieve and Xu, Xiaodong and Berghäuser, Gunnar and Malic, Ermin and Knorr, Andreas and Li, Xiaoqin}, year={2015}, month=sep }