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Valley Carrier Dynamics in Monolayer Molybdenum Disulfide from Helicity-Resolved Ultrafast Pump–Probe Spectroscopy
Open accessAbstract
We investigate the valley-related carrier dynamics in monolayer molybdenum disulfide using helicity-resolved nondegenerate ultrafast pump-probe spectroscopy at the vicinity of the high-symmetry K point under the temperature down to 78 K. Monolayer molybdenum disulfide shows remarkable transient reflection signals, in stark contrast to bilayer and bulk molybdenum disulfide due to the enhancement of many-body effect at reduced dimensionality. The helicity-resolved ultrafast time-resolved result shows that the valley polarization is preserved for only several picoseconds before the scattering process makes it undistinguishable. We suggest that the dynamical degradation of valley polarization is attributable primarily to the exciton trapping by defect states in the exfoliated molybdenum disulfide samples. Our experiment and a tight-binding model analysis also show that the perfect valley circular dichroism selectivity is fairly robust against disorder at the K point but quickly decays from the high-symmetry point in the momentum space in the presence of disorder.
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Cited by
Schaibley, J. R., Yu, H., Clark, G., Rivera, P., Ross, J. S., Seyler, K. L., Yao, W., & Xu, X. (2016) · Nature Reviews Materials · doi:10.1038/natrevmats.2016.55 · Cited by 2,652
Observation of Rapid Exciton–Exciton Annihilation in Monolayer Molybdenum Disulfide
Sun, D., Rao, Y., Reider, G. A., Chen, G., You, Y., Brézin, L., Harutyunyan, A. R., & Heinz, T. F. (2014) · Nano Letters · doi:10.1021/nl5021975 · Cited by 579
Self-citationUltrafast generation of pseudo-magnetic field for valley excitons in WSe 2 monolayers
Kim, J., Hong, X., Jin, C., Shi, S.-F., Chang, C.-Y. S., Chiu, M.-H., Li, L.-J., & Wang, F. (2014) · Science · doi:10.1126/science.1258122 · Cited by 332
Exciton valley dynamics probed by Kerr rotation inWSe2monolayers
Zhu, C. R., Zhang, K., Glazov, M., Urbaszek, B., Amand, T., Ji, Z. W., Liu, B. L., & Marie, X. (2014) · Physical Review B · doi:10.1103/physrevb.90.161302 · Cited by 314
Observation of Exciton–Exciton Interaction Mediated Valley Depolarization in Monolayer MoSe2
Mahmood, F., Alpichshev, Z., Lee, Y.-H., Kong, J., & Gedik, N. (2018) · Nano Letters · doi:10.1021/acs.nanolett.7b03953 · Cited by 60
Metadata
- Authors
- Wang, Q., Ge, S., Li, X., Qiu, J., Ji, Y., Feng, J., & Sun, D.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2013-11-18
- Volume
- 7
- Issue
- 12
- Pages
- 11087-11093
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2039195861
- Cited by
- 241
- References
- 0
- FWCI
- 12.14
- Type
- journal article
- Language
- en
- Open access
- green
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- Wang, Q., Ge, S., Li, X., Qiu, J., Ji, Y., Feng, J., & Sun, D. (2013). Valley Carrier Dynamics in Monolayer Molybdenum Disulfide from Helicity-Resolved Ultrafast Pump–Probe Spectroscopy. ACS Nano. https://doi.org/10.1021/nn405419h
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