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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2011, Volume 94, Issue 3, Pages 252–258
(Mi jetpl1984)
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This article is cited in 263 scientific papers (total in 264 papers)
CONDENSED MATTER
Flat bands in topological media
T. T. Heikkiläa, N. B. Kopninab, G. E. Volovikab a Low Temperature Laboratory, Helsinki University of Technology
b Landau Institute for Theoretical Physics, Russian Academy of Sciences
Abstract:
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. Here we show that in gapless topological media, the
bulk-surface and bulk-vortex correspondence is more effective: it
produces 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 [1, 2] and in the vortex core
in systems with topologically protected Fermi points (Weyl points) [3].
Flat band has an extremely singular density of
states, and we show that this property may give rise in particular
to surface superconductivity which could exist even at room temperature.
Received: 22.06.2011
Citation:
T. T. Heikkilä, N. B. Kopnin, G. E. Volovik, “Flat bands in topological media”, Pis'ma v Zh. Èksper. Teoret. Fiz., 94:3 (2011), 252–258; JETP Letters, 94:3 (2011), 233–239
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https://www.mathnet.ru/eng/jetpl1984 https://www.mathnet.ru/eng/jetpl/v94/i3/p252
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Abstract page: | 669 | Full-text PDF : | 157 | References: | 72 |
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