Issue 1, 2022

Negative valley polarization in doped monolayer MoSe2

Abstract

Monolayer molybdenum di-selenide (1L-MoSe2) 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-MoSe2 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.

Graphical abstract: Negative valley polarization in doped monolayer MoSe2

Article information

Article type
Paper
Submitted
30 7 2021
Accepted
30 11 2021
First published
30 11 2021

Phys. Chem. Chem. Phys., 2022,24, 191-196

Author version available

Negative valley polarization in doped monolayer MoSe2

Y. Wu, T. Taniguchi, K. Watanabe and J. Yan, Phys. Chem. Chem. Phys., 2022, 24, 191 DOI: 10.1039/D1CP03490A

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