Universität zu Köln

Hermanns, Maria ORCID: 0000-0003-2258-1945, Trebst, Simon ORCID: 0000-0002-1479-9736 and Rosch, Achim ORCID: 0000-0002-6586-5721 (2015). Spin-Peierls Instability of Three-Dimensional Spin Liquids with Majorana Fermi Surfaces. Phys. Rev. Lett., 115 (17). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

Three-dimensional (3D) variants of the Kitaev model can harbor gapless spin liquids with a Majorana Fermi surface on certain tricoordinated lattice structures such as the recently introduced hyperoctagon lattice. Here, we investigate Fermi surface instabilities arising from additional spin exchange terms (such as a Heisenberg coupling) which introduce interactions between the emergent Majorana fermion degrees of freedom. We show that independent of the sign and structure of the interactions, the Majorana surface is always unstable. Generically, the system spontaneously doubles its unit cell at exponentially small temperatures and forms a spin liquid with line nodes. Depending on the microscopics, further symmetries of the system can be broken at this transition. These spin-Peierls instabilities of a 3D spin liquid are closely related to BCS instabilities of fermions.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hermanns, Maria UNSPECIFIED orcid.org/0000-0003-2258-1945 UNSPECIFIED Trebst, Simon UNSPECIFIED orcid.org/0000-0002-1479-9736 UNSPECIFIED Rosch, Achim UNSPECIFIED orcid.org/0000-0002-6586-5721 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-389440
DOI:	10.1103/PhysRevLett.115.177205
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	115
Number:	17
Date:	2015
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TRANSITION; ORDER Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/38944