Topological objects in two-gap superconductor
Data(s) |
2008
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Resumo |
We discuss the non-Abelian topological objects, in particular the non-Abrikosov vortex and the magnetic knot made of the twisted non-Abrikosov vortex, in two-gap superconductor. We show that there are two types of non-Abrikosov vortex in Ginzburg-Landau theory of two-gap superconductor, the D-type which has no concentration of the condensate at the core and the N-type which has a non-trivial profile of the condensate at the core, under a wide class of realistic interaction potential. We prove that these non-Abrikosov vortices can have either integral or fractional magnetic flux, depending on the interaction potential. We show that they are described by the non-Abelian topology pi(2)(S-2) and pi(1)(S-1), in addition to the well-known Abelian topology pi(1)(S-1). Furthermore, we discuss the possibility to construct a stable magnetic knot in two-gap superconductor by twisting the non-Abrikosov vortex and connecting two periodic ends together, whose knot topology pi(3)(S-2) is described by the Chern-Simon index of the electromagnetic potential. We argue that similar topological objects may exist in multi-gap or multi-layer superconductors and multi-component Bose-Einstein condensates and superfluids, and discuss how these topological objects can be constructed in MgB2, Sr2RuO4, He-3, and liquid metallic hydrogen. ABRL Program of Korea Science and Engineering Foundation R02-2003-00010043-0 BSR Program of Korea Research Foundation KRF-2007-314-C00055 National Natural Science Foundation of China 10604024 |
Identificador | |
Idioma(s) |
英语 |
Fonte |
Cho, YM (Cho, Y. M.); Zhang, PM (Zhang, P. M.).Topological objects in two-gap superconductor,EUROPEAN PHYSICAL JOURNAL B,2008,65(2):155-178 |
Palavras-Chave | #CLASSICAL FIELD-THEORY #GAUGE-THEORY #VORTEX #VORTICES #PHASE #KNOT #SPECTRUM #STRINGS #NUMBER #MGB2 |
Tipo |
期刊论文 |