Spin-Selective Hole-Exciton Coupling in a V-Doped WSe2 Ferromagnetic Semiconductor at Room Temperature
- 주제(키워드) vdW materials , diluted ferromagnetic semiconductors , excitons , trions , spin-valley coupling
- 주제(기타) Chemistry, Multidisciplinary
- 주제(기타) Chemistry, Physical
- 주제(기타) Nanoscience & Nanotechnology
- 주제(기타) Materials Science, Multidisciplinary
- 설명문(일반) [Nguyen, Lan-Anh T.; Nguyen, Tuan Dung; Hong, Chengyun; Luong, Dinh Hoa; Kim, Young-Min; Kim, Ji-Hee; Duong, Dinh Loc; Lee, Young Hee] Inst Basic Sci IBS, Ctr Integrated Nanostruct Phys CINAP, Suwon 16419, South Korea; [Nguyen, Lan-Anh T.; Dhakal, Krishna P.; Choi, Wooseon; Nguyen, Tuan Dung; Hong, Chengyun; Kim, Young-Min; Kim, Jeongyong; Kim, Ji-Hee; Duong, Dinh Loc; Lee, Young Hee] Sungkyunkwan Univ, Dept Energy Sci, Suwon 16419, South Korea; [Lee, Yuhan; Lee, Myeongwon; Lee, Donghun] Korea Univ, Dept Phys, Seoul 02841, South Korea; [Choi, Taeyoung; Heinrich, Andreas J.] Inst Basic Sci IBS, Ctr Quantum Nanosci, Seoul 03760, South Korea; [Choi, Taeyoung; Heinrich, Andreas J.] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea; [Lee, Young Hee] Sungkyunkwan Univ, Dept Phys, Suwon 16419, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 AMER CHEMICAL SOC
- 발행년도 2021
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000190260
- 본문언어 영어
- Published As https://doi.org/10.1021/acsnano.1c08375
- PubMed https://pubmed.ncbi.nlm.nih.gov/34807575
초록/요약
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.
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