Universität zu Köln

Rosch, Achim ORCID: 0000-0002-6586-5721 (2012). Unwinding of a one-dimensional topological superconductor. Phys. Rev. B, 86 (12). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1098-0121

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Abstract

We show that a topological superconductor made of four chains of superconducting spinless fermions characterized by four Majorana edge states can adiabatically be deformed into a trivial band insulator. To unwind this time-reversal invariant topological superconductor, interactions to spinful fermions are switched on along an adiabatic path. Thereby, we couple modes which belong to two different representations of the time-reversal symmetry operator tau with tau(2) = 1 and tau(2) = -1, respectively. This observation can be understood by investigating how the relevant symmetries act on the entanglement spectrum giving rise to four instead of eight different topological phases with Majorana edge modes. We also show that a simple level crossing of doubly and singly degenerate states occurs in the entanglement spectrum on deforming the quantum state.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Rosch, Achim UNSPECIFIED orcid.org/0000-0002-6586-5721 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-483020
DOI:	10.1103/PhysRevB.86.125120
Journal or Publication Title:	Phys. Rev. B
Volume:	86
Number:	12
Date:	2012
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1098-0121
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INSULATORS Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48302