Helicity resolved ultrafast pump-probe spectroscopy of monolayer molybdenum disulphide

Jun Qiu; Qinsheng Wang; Shaofeng Ge; Yanxin Ji; Dong Sun

doi:10.1117/12.2063225

5 September 2014 Helicity resolved ultrafast pump-probe spectroscopy of monolayer molybdenum disulphide

Jun Qiu, Qinsheng Wang, Shaofeng Ge, Yanxin Ji, Dong Sun

Proceedings Volume 9198, Ultrafast Nonlinear Imaging and Spectroscopy II; 91980M (2014) https://doi.org/10.1117/12.2063225
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

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.

Citation Download Citation

Jun Qiu, Qinsheng Wang, Shaofeng Ge, Yanxin Ji, and Dong Sun "Helicity resolved ultrafast pump-probe spectroscopy of monolayer molybdenum disulphide", Proc. SPIE 9198, Ultrafast Nonlinear Imaging and Spectroscopy II, 91980M (5 September 2014); https://doi.org/10.1117/12.2063225

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