Universität zu Köln

Kennedy, Ricardo (2016). Topological Hopf-Chern insulators and the Hopf superconductor. Phys. Rev. B, 94 (3). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We introduce new three-dimensional (3D) topological phases of two-band models using the Pontryagin-Thom construction. In symmetry class A these are the infinitely many Hopf-Chern topological insulators, which are hybrids of layered Chern insulators and Hopf insulators. Being constructed by a modification of the experimentally observed Chern insulators, these provide promising candidates for the observation of a genuinely 3D topological phase in class A. In symmetry class C, there is a Z(2) classification with the nontrivial topological phase, the Hopf superconductor, being realized by a construction that doubles a Hopf insulator in momentum space. For these new topological phases we introduce concrete tight-binding Hamiltonians and investigate their energy spectra in the presence of a boundary, revealing gapless surface modes in accordance with the bulk-boundary correspondence.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kennedy, Ricardo UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-269803
DOI:	10.1103/PhysRevB.94.035137
Journal or Publication Title:	Phys. Rev. B
Volume:	94
Number:	3
Date:	2016
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SINGLE DIRAC CONE; QUANTUM; STATES Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26980