Photonic Weyl points due to broken time-reversal symmetry in magnetized semiconductor

Research output: Contribution to journalArticle

Authors

  • Dongyang Wang
  • Biao Yang
  • Hongwei Jia
  • Quanlong Yang
  • Xieyu Chen
  • Minggui Wei
  • Jiaguang Han
  • Weili Zhang

Colleges, School and Institutes

External organisations

  • Tianjin University
  • University of Birmingham
  • Oklahoma State University - Stillwater

Abstract

Weyl points are discrete locations in the three-dimensional momentum space where two bands cross linearly with each other. They serve as the monopoles of Berry curvature in the momentum space, and their existence requires breaking of either time-reversal or inversion symmetry. Although various non-centrosymmetric Weyl systems have been reported, demonstration of Weyl degeneracies due to breaking of the time-reversal symmetry remains scarce and is limited to electronic systems. Here, we report the experimental observation of photonic Weyl degeneracies in a magnetized semiconductor—InSb, which behaves as a magnetized plasma for electromagnetic waves at the terahertz band. By varying the magnetic field strength, Weyl points and the corresponding photonic Fermi arcs have been demonstrated. Our observation establishes magnetized semiconductors as a reconfigurable terahertz Weyl system, which may prompt research on novel magnetic topological phenomena such as chiral Majorana-type edge states and zero modes in classic systems.

Details

Original languageEnglish
Pages (from-to)1150-1155
Number of pages6
JournalNature Physics
Volume15
Issue number11
Publication statusPublished - 19 Aug 2019

Keywords

  • Weyl points, Time-domain spectroscopy, Terahertz