Generating arbitrary topological windings of a non-Hermitian band
Abstract
Controlling the topology of a system provides a route to develop devices that are robust against defects. Whereas earlier developments of topological band theory focused on Hermitian (closed) systems, recent efforts have been toward non-Hermitian (open) systems. K. Wang et al. report on the measurement and control of topologically nontrivial windings of a non-Hermitian energy band. By implementing non-Hermitian lattice Hamiltonians along a frequency synthetic dimension formed by optical frequency modes in a modulated ring-resonator, they directly visualized the nontrivial topological band winding and showed that the winding can be controlled. Such control provides a route for the experimental synthesis, characterization, and control of topologically nontrivial phases in open physical systems.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 19, 2021
- Source ID
- 10.1126/science.abf6568
Entities
People
- Avik Dutt
- Casey Wojcik
- Jelena Vučković
- Kai Wang
- Ki Youl Yang
- Shanhui Fan
Organizations
- Air Force Office of Scientific Research
- Stanford University
- United States Department of Defense