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Spin-Selective Hole-Exciton Coupling in a V-Doped WSe2 Ferromagnetic Semiconductor at Room Temperature
- Title
- Spin-Selective Hole-Exciton Coupling in a V-Doped WSe2 Ferromagnetic Semiconductor at Room Temperature
- Authors
- Nguyen, Lan-Anh T.; Dhakal, Krishna P.; Lee, Yuhan; Choi, Wooseon; Nguyen, Tuan Dung; Hong, Chengyun; Luong, Dinh Hoa; Kim, Young-Min; Kim, Jeongyong; Lee, Myeongwon; Choi, Taeyoung; Heinrich, Andreas J.; Kim, Ji-Hee; Lee, Donghun; Duong, Dinh Loc; Lee, Young Hee
- Ewha Authors
- Andreas Heinrich; 최태영
- SCOPUS Author ID
- Andreas Heinrich; 최태영
- Issue Date
- 2021
- Journal Title
- ACS NANO
- ISSN
- 1936-0851
1936-086X
- Citation
- ACS NANO vol. 15, no. 12, pp. 20267 - 20277
- Keywords
- vdW materials; diluted ferromagnetic semiconductors; excitons; trions; spin-valley coupling
- Publisher
- AMER CHEMICAL SOC
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- 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.
- DOI
- 10.1021/acsnano.1c08375
- Appears in Collections:
- 자연과학대학 > 물리학전공 > Journal papers
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