Pairing Obstructions in Topological Superconductors.
Phys Rev Lett
; 124(24): 247001, 2020 Jun 19.
Article
en En
| MEDLINE
| ID: mdl-32639809
ABSTRACT
The modern understanding of topological insulators is based on Wannier obstructions in position space. Motivated by this insight, we study topological superconductors from a position-space perspective. For a one-dimensional superconductor, we show that the wave function of an individual Cooper pair decays exponentially with separation in the trivial phase and polynomially in the topological phase. For the position-space Majorana representation, we show that the topological phase is characterized by a nonzero Majorana polarization, which captures an irremovable and quantized separation of Majorana Wannier centers from the atomic positions. We apply our results to diagnose second-order topological superconducting phases in two dimensions. Our work establishes a vantage point for the generalization of topological quantum chemistry to superconductivity.
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2020
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Article
País de afiliación:
Suiza