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

Lan Anh T. Nguyen, Krishna P. Dhakal, Yuhan Lee, Wooseon Choi, Tuan Dung Nguyen, Chengyun Hong, Dinh Hoa Luong, Young Min Kim, Jeongyong Kim, Myeongwon Lee, Taeyoung Choi, Andreas J. Heinrich, Ji Hee Kim, Donghun Lee, Dinh Loc Duong, Young Hee Lee

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

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.

Original languageEnglish
Pages (from-to)20267-20277
Number of pages11
JournalACS Nano
Volume15
Issue number12
DOIs
StatePublished - 28 Dec 2021

Keywords

  • diluted ferromagnetic semiconductors
  • excitons
  • spin-valley coupling
  • trions
  • vdW materials

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