期刊
PHYSICAL REVIEW LETTERS
卷 119, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.246401
关键词
-
资金
- German Science Foundation (DFG) [CRC-TR 183, SPP 1666]
Second-order topological insulators are crystalline insulators with a gapped bulk and gapped crystalline boundaries, but with topologically protected gapless states at the intersection of two boundaries. Without further spatial symmetries, five of the ten Altland-Zirnbauer symmetry classes allow for the existence of such second-order topological insulators in two and three dimensions. We show that reflection symmetry can be employed to systematically generate examples of second-order topological insulators and superconductors, although the topologically protected states at corners (in two dimensions) or at crystal edges (in three dimensions) continue to exist if reflection symmetry is broken. A three-dimensional secondorder topological insulator with broken time-reversal symmetry shows a Hall conductance quantized in units of e(2)/h.
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