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Spin-Selective Hole-Exciton Coupling in a V-Doped WSe2Ferromagnetic Semiconductor at Room Temperature

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Title
Spin-Selective Hole-Exciton Coupling in a V-Doped WSe2Ferromagnetic Semiconductor at Room Temperature
Author(s)
Lan-Anh T. Nguyen; Dhakal, Krishna P.; Lee, Yuhan; Choi, Wooseon; Tuan Dung Nguyen; Chengyun Hong; Dinh Hoa Luong; Young-Min Kim; Kim, Jeongyong; Lee, Myeongwon; Taeyoung Choi; Andreas J. Heinrich; Ji-Hee Kim; Lee, Donghun; Dinh Loc Duong; Young Hee Lee
Publication Date
2021-12-28
Journal
ACS Nano, v.15, no.12, pp.20267 - 20277
Publisher
American Chemical Society
Abstract
© 2021 American Chemical Society.While valley polarization with strong Zeeman splitting is the most prominent characteristic of two-dimensional (2D) transition metal dichalcogenide (TMD) semiconductors under magnetic fields, enhancement of the Zeeman splitting has been demonstrated by incorporating magnetic dopants into the host materials. Unlike Fe, Mn, and Co, V is a distinctive dopant for ferromagnetic semiconducting properties at room temperature with large Zeeman shifting of band edges. Nevertheless, little known is the excitons interacting with spin-polarized carriers in V-doped TMDs. Here, we report anomalous circularly polarized photoluminescence (CPL) in a V-doped WSe2 monolayer at room temperature. Excitons couple to V-induced spin-polarized holes to generate spin-selective positive trions, leading to differences in the populations of neutral excitons and trions between left and right CPL. Using transient absorption spectroscopy, we elucidate the origin of excitons and trions that are inherently distinct for defect-mediated and impurity-mediated trions. Ferromagnetic characteristics are further confirmed by the significant Zeeman splitting of nanodiamonds deposited on the V-doped WSe2 monolayer.
URI
https://pr.ibs.re.kr/handle/8788114/10994
DOI
10.1021/acsnano.1c08375
ISSN
1936-0851
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
Center for Quantum Nanoscience(양자나노과학 연구단) > 1. Journal Papers (저널논문)
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