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Skyrme Insulators: Insulators at the Brink of Superconductivity.
Erten, Onur; Chang, Po-Yao; Coleman, Piers; Tsvelik, Alexei M.
Afiliação
  • Erten O; Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08854, USA.
  • Chang PY; Max Planck Institute for the Physics of Complex Systems, D-01187 Dresden, Germany.
  • Coleman P; Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08854, USA.
  • Tsvelik AM; Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08854, USA.
Phys Rev Lett ; 119(5): 057603, 2017 Aug 04.
Article em En | MEDLINE | ID: mdl-28949703
ABSTRACT
Current theories of superfluidity are based on the idea of a coherent quantum state with topologically protected quantized circulation. When this topological protection is absent, as in the case of ^{3}He-A, the coherent quantum state no longer supports persistent superflow. Here, we argue that the loss of topological protection in a superconductor gives rise to an insulating ground state. We specifically introduce the concept of a Skyrme insulator to describe the coherent dielectric state that results from the topological failure of superflow carried by a complex-vector order parameter. We apply this idea to the case of SmB_{6}, arguing that the observation of a diamagnetic Fermi surface within an insulating bulk can be understood as a realization of this state. Our theory enables us to understand the linear specific heat of SmB_{6} in terms of a neutral Majorana Fermi sea and leads us to predict that in low fields of order a Gauss, SmB_{6} will develop a Meissner effect.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2017 Tipo de documento: Article País de afiliação: Estados Unidos

Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2017 Tipo de documento: Article País de afiliação: Estados Unidos