Monolayer molybdenum di-selenide (1L-MoSe 2 ) stands out in the transition metal dichalcogenide family of materials as an outlier where optical generation of valley polarization is inefficient. Here we show that using charge doping in conjunction with an external magnetic field, the valley polarization of 1L-MoSe 2 can be controlled effectively. Most remarkably, the valley polarization can be tuned to negative values, where the higher energy Zeeman mode emission is more intense than the lower energy one. Our experimental observations are interpreted with valley-selective exciton-charge dressing that manifests when gate induced doping populates predominantly one valley in the presence of Zeeman splitting.
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Wu, Yueh-Chun ; Taniguchi, Takashi ; Watanabe, Kenji ; Yan, Jun ( , Physical Review B)
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Wang, Yiping ; Petrides, Ioannis ; McNamara, Grant ; Hosen, Md Mofazzel ; Lei, Shiming ; Wu, Yueh-Chun ; Hart, James L. ; Lv, Hongyan ; Yan, Jun ; Xiao, Di ; et al ( , Nature)
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Li, Gaomin ; Wu, Xiaohua ; Gao, Yifan ; Ma, Xiaoming ; Hou, Fuchen ; Cheng, Hanyan ; Huang, Qiaoling ; Wu, Yueh-Chun ; DeCapua, Matthew C. ; Zhang, Yujun ; et al ( , Nano Letters)
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DeCapua, Matthew C. ; Wu, Yueh-Chun ; Taniguchi, Takashi ; Watanabe, Kenji ; Yan, Jun ( , Applied Physics Letters)
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Goldstein, Thomas ; Wu, Yueh-Chun ; Chen, Shao-Yu ; Taniguchi, Takashi ; Watanabe, Kenji ; Varga, Kalman ; Yan, Jun ( , The Journal of Chemical Physics)
