Evidence of the polaronic character of excitons in a two-dimensional ferromagnet
ORAL
Abstract
Studies of exciton dynamics in two-dimensional (2D) transition metal dichalcogenide (TMDC) semiconductors have led to discoveries of a variety of fascinating properties for optoelectronic applications. It has been known that exciton dynamics can be strongly affected by lattice vibrations through electron-phonon (e-ph) coupling. The recently discovered 2D ferromagnetic semiconductor, CrI3, provides a new platform to explore exciton physics beyond the well-studied 2D TMDC semiconductors because of its localized orbitals, intrinsic long-range ferromagnetic order, and strong e-ph coupling. Here we use linear absorption spectroscopy to identify the exciton resonance transitions in bilayer CrI3. We further use resonant micro-Raman spectroscopy to explore the electron-phonon coupling in bilayer CrI3. Temperature and magnetic field dependence of e-ph coupling in bilayer CrI3 will be discussed.
*Supported by NSF CAREER Grants No. DMR-1760668 and No. DMR-1749774.
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Presenters
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Zhipeng Ye
- Department of Electrical and Computer Engineering, Texas Tech University
- Texas Tech University
- Texas Tech Univ