An Anomalous Magneto-Optic Effect in Epitaxial Indium Selenide Layers

Wei Fu, Xiaoxu Zhao, Ke Wang, Zhi Chen, Kai Leng, Deyi Fu, Peng Song, Hai Wang, Longjiang Deng, Stephen J. Pennycook, Gang Zhang, Bo Peng, Kian Ping Loh

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

Single-phonon modes offer potential applications in quantum phonon optics, but the phonon density of states of most materials consist of mixed contributions from coupled phonons. Here, using theoretical calculations and magneto-Raman measurements, we report two single-phonon vibration modes originating from the breathing and opposite out-of-plane vibrations of InSe layers. These single-phonon vibrations exhibit an anticorrelated scattering rotations of the polarization axis under an applied vertical magnetic field; such an anomalous magneto-optical behavior is due to the reverse bond polarizations of two quantum atomic vibrations, which induce different symmetry for the corresponding Raman selection rules. A 180° (+90° and -90°) integrated scattering rotation angle of two single-phonon modes was achieved when the magnetic field was swept from 0 to 6 T. This work demonstrates new ways to manipulate the magneto-optic effect through phonon polarity-based symmetry control and opens avenues for exploring single-phonon-vibration-based nanomechanical oscillators and magneto-phonon-coupled physics.

Original languageEnglish
Pages (from-to)5330-5338
Number of pages9
JournalNano Letters
Volume20
Issue number7
DOIs
Publication statusPublished - 8 Jul 2020
Externally publishedYes

Keywords

  • atomic layers
  • magneto-optic effect
  • magneto-Raman
  • phonon polarity
  • phonon vibrations

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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