Flat Band in Topological Matter
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- 作者：G. E. Volovik (1) (2)
- 关键词：Weyl point ; Flat band ; Fermi arc ; Surface superconductivity
- 刊名：Journal of Superconductivity Incorporating Novel Magnetism
- 出版年：2013
- 出版时间：September 2013
- 年：2013
- 卷：26
- 期：9
- 页码：2887-2890
- 全文大小：391KB
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1. O.V. Lounasmaa Laboratory, Aalto University, P.O. Box 15100, 00076, Aalto, Finland
2. L.D. Landau Institute for Theoretical Physics, Kosygina 2, 119334, Moscow, Russia
文摘
Topological media are systems whose properties are protected by topology, and thus are robust to deformations of the system. In topological insulators and superconductors, the bulk-surface and bulk-vortex correspondence gives rise to the gapless Weyl, Dirac, or Majorana fermions on the surface of the system and inside vortex cores. In gapless topological media, the bulk-surface and bulk-vortex correspondence produce topologically protected gapless fermions without dispersion—the flat band. Fermion zero modes forming the flat band are localized on the surface of topological media with protected nodal lines and in the vortex core in systems with topologically protected Fermi points (Weyl points). Flat band has an extremely singular density of states, and this property may give rise in particular to surface superconductivity, which in principle could exist even at room temperature.