Fig. 4: Electrical tuning of trion valley dynamics. | Nature Communications

Fig. 4: Electrical tuning of trion valley dynamics.

From: Prolonging valley polarization lifetime through gate-controlled exciton-to-trion conversion in monolayer molybdenum ditelluride

Fig. 4

a Gate-dependent transient differential reflectance spectra of trions with ΔE of 15 meV in Device #2. The extracted DVP for trions (blue dots) can be fitted by exponential functions after the depletion of free excitons. b The gate-dependence of fitted intravalley lifetime \(1/{\Gamma }_{{{{{{\rm{T}}}}}}}^{{{{{{\rm{ia}}}}}}}\) (black dots), and intervalley decay time \(1/{\Gamma }_{{{{{{\rm{T}}}}}}}^{{{{{{\rm{ir}}}}}}}\) (blue dots). The solid lines are polynomial fits, showing the data trends with gate voltages. Error bars represent the uncertainty of lifetimes by exponential fitting. c Colored contour of DVP for trions and the calculated DVP (magenta dots) using measured decay time in b from Eq. (2b).

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