Spin-Selective Hole-Exciton Coupling in a V-Doped WSe 2 Ferromagnetic Semiconductor at Room Temperature.

Autor:	Nguyen LT; Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon 16419, Republic of Korea.; Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea., Dhakal KP; Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea., Lee Y; Department of Physics, Korea University, Seoul 02841, Republic of Korea., Choi W; Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea., Nguyen TD; Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon 16419, Republic of Korea.; Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea., Hong C; Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon 16419, Republic of Korea.; Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea., Luong DH; Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon 16419, Republic of Korea., Kim YM; Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon 16419, Republic of Korea.; Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea., Kim J; Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea., Lee M; Department of Physics, Korea University, Seoul 02841, Republic of Korea., Choi T; Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Korea.; Department of Physics, Ewha Womans University, Seoul 03760, Korea., Heinrich AJ; Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Korea.; Department of Physics, Ewha Womans University, Seoul 03760, Korea., Kim JH; Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon 16419, Republic of Korea.; Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea., Lee D; Department of Physics, Korea University, Seoul 02841, Republic of Korea., Duong DL; Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon 16419, Republic of Korea.; Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea., Lee YH; Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Suwon 16419, Republic of Korea.; Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea.; Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea.
Jazyk:	angličtina
Zdroj:	ACS nano [ACS Nano] 2021 Dec 28; Vol. 15 (12), pp. 20267-20277. Date of Electronic Publication: 2021 Nov 22.
DOI:	10.1021/acsnano.1c08375
Abstrakt:	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 WSe 2 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 WSe 2 monolayer.
Databáze:	MEDLINE
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