Weyl Exceptional Rings in a Three-Dimensional Dissipative Cold Atomic Gas (Author's Manuscript)
Journal Article - Open Access
University of Michigan Ann Arbor United States
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Three-dimensional topological Weyl semimetals can generally support a zero dimensional Weyl point characterized by a quantized Chern number or a one-dimensional Weyl nodal ring or line characterized by a quantized Berry phase in the momentum space. Here, in a dissipative system with particle gain and loss, we discover a new type of topological ring, dubbed Weyl exceptional ring consisting of exceptional points at which two eigenstates coalesce. Such a Weyl exceptional ring is characterized by both a quantized Chern number and a quantized Berry phase, which are defined via the Riemann surface. We propose an experimental scheme to realize and measure the Weyl exceptional ring in a dissipative cold atomic gas trapped in an optical lattice.
- Physical Chemistry
- Numerical Mathematics