Spontaneous emission and resonant scattering in transition from type I to type II photonic Weyl systems

Research output: Contribution to journalArticle

Authors

  • Yang Yang
  • Lingbo Xia
  • Hua Cheng
  • Hongwei Jia
  • Yuanjiang Xiang

Colleges, School and Institutes

External organisations

  • Shenzhen University

Abstract

Spontaneous emission and scattering behavior of an emitter or a resonant scatterer strongly depend on the density of state of the surrounding medium. It has been shown that resonant scattering cross section }{(RSC)}{ may diverge at the Weyl frequency of a type-I Weyl system due to the diminishing density of states. Here }{we study the spontaneous emission (SE) and RSC in a photonic metacrystal across the critical transition between type-I and type-II Weyl systems. }{Theoretical results show that the SE rate of an emitter in a type-I Weyl system diminishes to zero at the Weyl frequency. When the system is tuned towards the transition point between type-I and type-II Weyl point, the dip in the }SE{ spectrum at the Weyl frequency becomes infinitely sharp. The dip vanishes at the critical transition, and transforms into a peak when the system changes into a type-II Weyl system. We further show that t}{he resonant scattering cross section also exhibits dramatically different spectral features across the transition. Our study demonstrates the ability to tune SE and RSC through altering the dispersion of Weyl medium between type-I and type-II, which provides a fundamentally new route in manipulating light-matter interactions.

Details

Original languageEnglish
Article number033901
JournalPhysical Review Letters
Volume123
Issue number3
Early online date15 Jul 2019
Publication statusPublished - 19 Jul 2019