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Proceedings Paper

Helicity resolved ultrafast pump-probe spectroscopy of monolayer molybdenum disulphide
Author(s): Jun Qiu; Qinsheng Wang; Shaofeng Ge; Yanxin Ji; Dong Sun
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Paper Abstract

We investigate the valley related carrier dynamics in monolayer MoS2 using helicity resolved non-degenerate ultrafast pump-probe spectroscopy at the vicinity of the high-symmetry K point under the temperature down to 78 K. Monolayer MoS2 shows remarkable transient reflection signals, in stark contrast to bilayer and bulk MoS2 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 ps before 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 MoS2 samples.

Paper Details

Date Published: 5 September 2014
PDF: 9 pages
Proc. SPIE 9198, Ultrafast Nonlinear Imaging and Spectroscopy II, 91980M (5 September 2014); doi: 10.1117/12.2063225
Show Author Affiliations
Jun Qiu, Peking Univ. (China)
Collaborative Innovation Ctr. of Quantum Matter (China)
Qinsheng Wang, Peking Univ. (China)
Collaborative Innovation Ctr. of Quantum Matter (China)
Shaofeng Ge, Peking Univ. (China)
Collaborative Innovation Ctr. of Quantum Matter (China)
Yanxin Ji, Peking Univ. (China)
Collaborative Innovation Ctr. of Quantum Matter (China)
Dong Sun, Peking Univ. (China)
Collaborative Innovation Ctr. of Quantum Matter (China)


Published in SPIE Proceedings Vol. 9198:
Ultrafast Nonlinear Imaging and Spectroscopy II
Zhiwen Liu, Editor(s)

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