Universität zu Köln

Duivenvoorden, Kasper and Quella, Thomas ORCID: 0000-0002-5441-4124 (2012). Discriminating string order parameter for topological phases of gapped SU(N) spin chains. Phys. Rev. B, 86 (23). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1098-0121

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Abstract

One-dimensional gapped spin chains with symmetry PSU(N) = SU(N)/Z(N) are known to possess N different topological phases. In this paper, we introduce a nonlocal string order parameter which characterizes each of these N phases unambiguously. Numerics confirm that our order parameter allows one to extract a quantized topological invariant from a given nondegenerate gapped ground state wave function. Discontinuous jumps in the discrete topological order that arise when varying physical couplings in the Hamiltonian may be used to detect quantum phase transitions between different topological phases. DOI: 10.1103/PhysRevB.86.235142

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Duivenvoorden, Kasper UNSPECIFIED UNSPECIFIED UNSPECIFIED Quella, Thomas UNSPECIFIED orcid.org/0000-0002-5441-4124 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-476474
DOI:	10.1103/PhysRevB.86.235142
Journal or Publication Title:	Phys. Rev. B
Volume:	86
Number:	23
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 BOND GROUND-STATES; QUANTUM SPIN; SYMMETRY-BREAKING; ANTIFERROMAGNETS; MODELS Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47647