期刊
PHYSICAL REVIEW LETTERS
卷 119, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.246402
关键词
-
资金
- National Key Research and Development Program of China [2016YFA0302400]
- National Science Foundation of China [11674370]
We study fourfold rotation-invariant gapped topological systems with time-reversal symmetry in two and three dimensions (d = 2, 3). We show that in both cases nontrivial topology is manifested by the presence of the (d-2)-dimensional edge states, existing at a point in 2D or along a line in 3D. For fermion systems without interaction, the bulk topological invariants are given in terms of the Wannier centers of filled bands and can be readily calculated using a Fu-Kane-like formula when inversion symmetry is also present. The theory is extended to strongly interacting systems through the explicit construction of microscopic models having robust (d-2)-dimensional edge states.
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