Accession Number : AD1048265


Title :   Weyl Exceptional Rings in a Three-Dimensional Dissipative Cold Atomic Gas (Author's Manuscript)


Descriptive Note : Journal Article - Open Access


Corporate Author : University of Michigan Ann Arbor United States


Personal Author(s) : Xu,Yong ; Wang,Sheng-Tao ; Duan,L -M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1048265.pdf


Report Date : 27 Jan 2017


Pagination or Media Count : 6


Abstract : 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.


Descriptors :   fermions , MANIFOLDS MATHEMATICS , COLD GASES


Subject Categories : Physical Chemistry
      Numerical Mathematics


Distribution Statement : APPROVED FOR PUBLIC RELEASE