Flat band in the core of topological defects: bulk-vortex correspondence in topological superfluids with Fermi points

Details Flat band in the core of topological defects: bulk-vortex correspondence in topological superfluids with Fermi points Flat band in the core of topological defects: bulk-vortex correspondence in topological superfluids with Fermi points

2010-11-21

arxiv.org/abs/1011.4665v3

Pisma Zh.Eksp.Teor.Fiz. 93:69-72,2011; JETP Lett.93:66-69,2011

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure, JETP Lett. style, submitted to JETP Lett., abstract is corrected

Scientific paper

10.1134/S0021364011020147

We discuss the dispersionless spectrum with zero energy in the linear topological defects - vortices. The flat band emerges inside the vortex living in the bulk medium containing topologically stable Fermi points in momentum space. The boundaries of the flat band in the vortex are determined by projections of the Fermi points in bulk to the vortex axis. This bulk-vortex correspondence for flat band is similar to the bulk-surface correspondence discussed earlier in the media with topologically protected lines of zeroes. In the latter case the flat band emerges on the surface of the system, and its boundary is determined by projection of the bulk nodal line on the surface.

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