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Cited by 602D Materials and ApplicationsSemiconductor Quantum Structures and DevicesQuantum and electron transport phenomena

Observation of Exciton–Exciton Interaction Mediated Valley Depolarization in Monolayer MoSe2

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Mahmood, Fahad, Alpichshev, Zhanybek, Lee, Yi-Hsien, Kong, Jing, Gedik, Nuh·2018·Nano Letters
DOI 10.1021/acs.nanolett.7b03953
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Abstract

The valley pseudospin in monolayer transition metal dichalcogenides (TMDs) has been proposed as a new way to manipulate information in various optoelectronic devices. This relies on a large valley polarization that remains stable over long time scales (hundreds of nanoseconds). However, time-resolved measurements report valley lifetimes of only a few picoseconds. This has been attributed to mechanisms such as phonon-mediated intervalley scattering and a precession of the valley pseudospin through electron–hole exchange. Here we use transient spin grating to directly measure the valley depolarization lifetime in monolayer MoSe 2 . We find a fast valley decay rate that scales linearly with the excitation density at different temperatures. This establishes the presence of strong exciton–exciton Coulomb exchange interactions enhancing the valley depolarization. Our work highlights the microscopic processes inhibiting the efficient use of the exciton valley pseudospin in monolayer TMDs.

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  • Prior art on cryogenic TGS investigated thermal, spin, and acoustic transport property evolution in several solid-state materials.

    “Separately, prior art on cryogenic TGS investigated thermal [17], spin [18], and acoustic [19, 20] transport property evolution in several solid-state materials [21].”

    From A facility for thermo-mechanical characterization of fusion magnet materials during cryogenic ion irradiation (2025) · cites this paper as [18]

    The paper uses transient spin grating measurements on monolayer MoSe₂ at 4 K and room temperature and reports a temperature-dependent valley depolarization lifetime (pp. 3–4), so it supports an example of cryogenic grating work in a solid-state material. But its discussion on p. 5 says diffusion is negligible and identifies the measured decay as valley depolarization, not a transport property; it does not itself investigate thermal or acoustic transport. (LLM, conf=0.85)

    Experimental — accuracy not yet measured

  • Prior art on cryogenic TGS investigated thermal, spin, and acoustic transport property evolution in several solid-state materials.

    “Separately, prior art on cryogenic TGS investigated thermal [17], spin [18], and acoustic [19, 20] transport property evolution in several solid-state materials [21].”

    From A facility for thermo-mechanical characterization of fusion magnet materials during cryogenic ion irradiation (2025) · cites this paper as [18]

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Research works printed but not linked: 39

  1. [1](1) Xiao, D.; Liu, G.-B.; Feng, W.; Xu, X.; Yao, W. Phys. Rev. Lett. 2012 , 108 , 196802. -
  2. [2](2) Mak, K. F.; He, K.; Shan, J.; Heinz, T. F. Nat. Nanotechnol. 2012 , 7 , 494-498. -
  3. [3](3) Zeng, H.; Dai, J.; Yao, W.; Xiao, D.; Cui, X. Nat. Nanotechnol. 2012 , 7 , 490-493. -
  4. [4](4) Xu, X.; Yao, W.; Xiao, D.; Heinz, T. F. Nat. Phys. 2014 , 10 , 343-350. -
  5. [5](5) Kioseoglou, G.; Hanbicki, A. T.; Currie, M.; Friedman, A. L.; Gunlycke, D.; Jonker, B. T. Appl. Phys. Lett. 2012 , 101 , 221907. -
  6. [6](6) Dal Conte, S.; Bottegoni, F.; Pogna, E. A. A.; De Fazio, D.; Ambrogio, S.; Bargigia, I.; D'Andrea, C.; Lombardo, A.; Bruna, M.; Ciccacci, F.; Ferrari, A. C.; Cerullo, G.; Finazzi, M. Phys. Rev. B 2015 , 92 , 235425. -
  7. [7](7) Zhu, C. R.; Zhang, K.; Glazov, M.; Urbaszek, B.; Amand, T.; Ji, Z. W.; Liu, B. L.; Marie, X. Phys. Rev. B 2014 , 90 , 161302. -
  8. [8](8) Plechinger, G.; Nagler, P.; Arora, A.; Schmidt, R.; Chernikov, A.; del ´ Aguila, A. G.; Christianen, P. C.; Bratschitsch, R.; Sch¨ uller, C.; Korn, T. Nat. Commun. 2016 , 7 , 12715. -
  9. [9](9) Huang, J.; Hoang, T. B.; Ming, T.; Kong, J.; Mikkelsen, M. H. Phys. Rev. B 2017 , 95 , 075428. -
  10. [10](10) Lagarde, D.; Bouet, L.; Marie, X.; Zhu, C. R.; Liu, B. L.; Amand, T.; Tan, P. H.; Urbaszek, B. Phys. Rev. Lett. 2014 , 112 , 047401. -
  11. [11](11) Wang, G.; Bouet, L.; Lagarde, D.; Vidal, M.; Balocchi, A.; Amand, T.; Marie, X.; Urbaszek, B. Phys. Rev. B 2014 , 90 , 075413. -
  12. [12](12) Yan, T.; Qiao, X.; Tan, P.; Zhang, X. Sci. Rep. 2015 , 5 , 15625. -
  13. [14](14) Mai, C.; Barrette, A.; Yu, Y.; Semenov, Y. G.; Kim, K. W.; Cao, L.; Gundogdu, K. Nano Lett. 2014 , 14 , 202-206. -
  14. [15](15) Kumar, N.; He, J.; He, D.; Wang, Y.; Zhao, H. Nanoscale 2014 , 6 , 12690-12695. -
  15. [16](16) Schmidt, R.; Bergh¨ auser, G.; Schneider, R.; Selig, M.; Tonndorf, P.; Mali´ c, E.; Knorr, A.; de Vasconcellos, S. M.; Bratschitsch, R. Nano Lett. 2016 , 16 , 2945-2950. -
  16. [17](17) Wang, L.; Wu, M. Phys. Lett. A 2014 , 378 , 1336 - 1340. -
  17. [18](18) Glazov, M. M.; Amand, T.; Marie, X.; Lagarde, D.; Bouet, L.; Urbaszek, B. Phys. Rev. B 2014 , 89 , 201302. -
  18. [20](20) Wang, G.; Palleau, E.; Amand, T.; Tongay, S.; Marie, X.; Urbaszek, B. Appl. Phys. Lett. 2015 , 106 , 112101. -
  19. [22](22) Baranowski, M.; Surrente, A.; Maude, D. K.; Ballottin, M.; Mitioglu, A. A.; Christianen, P. C. M.; Kung, Y. C.; Dumcenco, D.; Kis, A.; Plochocka, P. 2D Mater. 2017 , 4 , 025016. -
  20. [23](23) Scholes, G. D.; Kim, J.; Wong, C. Y. Phys. Rev. B 2006 , 73 , 195325. -
  21. [24](24) Scholes, G. D.; Kim, J.; Wong, C. Y.; Huxter, V. M.; Nair, P. S.; Fritz, K. P.; Kumar, S. Nano Lett. 2006 , 6 , 1765-1771. -
  22. [25](25) Weng, M. Q.; Wu, M. W.; Cui, H. L. J. Appl. Phys. 2008 , 103 , 063714. -
  23. [26](26) Koralek, J. D.; Weber, C. P.; Orenstein, J.; Bernevig, B. A.; Zhang, S.-C.; Mack, S.; Awschalom, D. D. Nature 2009 , 458 , 610-613. -
  24. [28](28) Kim, J.; Wong, C. Y.; Scholes, G. D. Acc. Chem. Res. 2009 , 42 , 1037-1046. -
  25. [29](29) Lee, Y.-H.; Yu, L.; Wang, H.; Fang, W.; Ling, X.; Shi, Y.; Lin, C.-T.; Huang, J.-K.; Chang, M.-T.; Chang, C.-S.; Dresselhaus, M.; Palacios, T.; Li, L.-J.; Kong, J. Nano Lett. 2013 , 13 , 1852-1857. -
  26. [30](30) Fourkas, J. T.; Trebino, R.; Fayer, M. D. J. Chem. Phys 1992 , 97 , 69-77. -
  27. [31](31) Ross, J. S.; Wu, S.; Yu, H.; Ghimire, N. J.; Jones, A. M.; Aivazian, G.; Yan, J.; Mandrus, D. G.; Xiao, D.; Yao, W.; Xu, X. Nat. Commun. 2013 , 4 , 1474. -
  28. [33](33) Wang, X.; Gong, Y.; Shi, G.; Chow, W. L.; Keyshar, K.; Ye, G.; Vajtai, R.; Lou, J.; Liu, Z.; Ringe, E.; Tay, B. K.; Ajayan, P. M. ACS Nano 2014 , 8 , 5125-5131. -
  29. [34](34) Cui, Q.; Ceballos, F.; Kumar, N.; Zhao, H. ACS Nano 2014 , 8 , 2970-2976. -
  30. [35](35) Sun, D.; Rao, Y.; Reider, G. A.; Chen, G.; You, Y.; Brzin, L.; Harutyunyan, A. R.; Heinz, T. F. Nano Lett. 2014 , 14 , 5625-5629. -
  31. [36](36) Wang, H.; Zhang, C.; Rana, F. Nano Lett. 2015 , 15 , 339-345. -
  32. [37](37) Gedik, N.; Blake, P.; Spitzer, R. C.; Orenstein, J.; Liang, R.; Bonn, D. A.; Hardy, W. N. Phys. Rev. B 2004 , 70 , 014504. -
  33. [38](38) Dyakonov, M. I.; Perel, V. I. Sov. Phys. Solid State 1972 , 13 , 3023-3026. -
  34. [39](39) D'yakonov, M. I.; Perel', V. I. Sov. Phys. JETP 1971 , 33 , 1053. -
  35. [40](40) Hsu, W.-T.; Chen, Y.-L.; Chen, C.-H.; Liu, P.-S.; Hou, T.-H.; Li, L.-J.; Chang, W.-H. Nat. Commun. 2015 , 6 , 8963. -
  36. [41](41) Horzum, S.; Sahin, H.; Cahangirov, S.; Cudazzo, P.; Rubio, A.; Serin, T.; Peeters, F. M. Phys. Rev. B 2013 , 87 , 125415. -
  37. [42](42) Tonndorf, P.; Schmidt, R.; B¨ ottger, P.; Zhang, X.; B¨ orner, J.; Liebig, A.; Albrecht, M.; Kloc, C.; Gordan, O.; Zahn, D. R. T.; de Vasconcellos, S. M.; Bratschitsch, R. Opt. Express 2013 , 21 , 4908-4916. -
  38. [43](43) Wang, L.; Wu, M. W. Phys. Rev. B 2014 , 89 , 115302. -
  39. [44](44) Volmer, F.; Pissinger, S.; Ersfeld, M.; Kuhlen, S.; Stampfer, C.; Beschoten, B. Phys. Rev. B 2017 , 95 , 235408.

Cited by

Sorted by citations

Authors
Mahmood, F., Alpichshev, Z., Lee, Y.-H., Kong, J., & Gedik, N.
Affiliations
  • Massachusetts Institute of Technology (US)
  • National Tsing Hua University (TW)
Corresponding author
Gedik, Nuh
ORCID
Venue
Nano Letters
Publisher
American Chemical Society (ACS)
Published
2017-12-15
Volume
18
Issue
1
Pages
223-228
ISSN
  • 1530-6984 (ISSN-L)
  • 1530-6992
DOI
10.1021/acs.nanolett.7b03953
OpenAlex
W2775440864
Cited by
60
References
1
Citations by year
2026: 3 · 2025: 7 · 2024: 9 · 2023: 6 · 2022: 7 · 2021: 10 · 2020: 11 · 2019: 5 · 2018: 2
FWCI
2.08
Type
journal article
Language
en
Open access
Locations
  • Nano Letters (publishedVersion)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc)
  • arXiv (Cornell University)
Funders
  • Ministry of Science and Technology (MOST-105-2112-M-007-032-MY3, MOST-106-2119-M-007-023-MY3)
  • Gordon and Betty Moore Foundation (GBMF4540)
  • U.S. Department of Defense (FA2386-16-1-4009)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Semiconductor Quantum Structures and Devices
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum and electron transport phenomena
Keywords
valley depolarization, valley pseudospin, monolayer MoSe2, exciton-exciton interaction, Coulomb exchange interaction, transition metal dichalcogenides, valleytronics, intervalley scattering

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