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Magnetic Field Induced Inter‐Valley Trion Dynamics in Monolayer 2D Semiconductor
Author(s) -
Zhang Yan,
Shinokita Keisuke,
Watanabe Kenji,
Taniguchi Takashi,
Miyauchi Yuhei,
Matsuda Kazunari
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202006064
Subject(s) - trion , exciton , zeeman effect , condensed matter physics , magnetic field , polarization (electrochemistry) , monolayer , scattering , landau quantization , physics , materials science , nanotechnology , chemistry , quantum mechanics
The valley polarization dynamics of excitonic states (excitons and trions) in monolayer (1L)‐MoSe 2 under strong magnetic field are investigated. The experimentally observed magnetic‐field‐induced valley polarizations of trions (excitons) are analyzed by the rate equation model. It is found that the magnetic‐field‐induced valley polarizations are attributed to the asymmetric valley scattering of trions from K+ to K− valley and vice versa due to the degeneracy lifting of K+ and K− valleys by valley Zeeman effect under magnetic field. Moreover, the feeding of the valley‐polarized excitons for trions formation and longer inter‐valley scattering time reaching to a few nanoseconds at 10 K contribute to the larger valley polarization of trions than that of excitons in 1L‐MoSe 2 .