Unified Theory of PT and CP Invariant Topological Metals and Nodal Superconductors.
Phys Rev Lett
; 116(15): 156402, 2016 04 15.
Article
en En
| MEDLINE
| ID: mdl-27127977
ABSTRACT
As PT and CP symmetries are fundamental in physics, we establish a unified topological theory of PT and CP invariant metals and nodal superconductors, based on the mathematically rigorous KO theory. Representative models are constructed for all nontrivial topological cases in dimensions d=1, 2, and 3, with their exotic physical meanings being elucidated in detail. Intriguingly, it is found that the topological charges of Fermi surfaces in the bulk determine an exotic direction-dependent distribution of topological subgap modes on the boundaries. Furthermore, by constructing an exact bulk-boundary correspondence, we show that the topological Fermi points of the PT and CP invariant classes can appear as gapless modes on the boundary of topological insulators with a certain type of anisotropic crystalline symmetry.
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2016
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Article
País de afiliación:
Alemania