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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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
CreatorsEmailORCIDORCID Put Code
Hermanns, MariaUNSPECIFIEDorcid.org/0000-0003-2258-1945UNSPECIFIED
Trebst, SimonUNSPECIFIEDorcid.org/0000-0002-1479-9736UNSPECIFIED
Rosch, AchimUNSPECIFIEDorcid.org/0000-0002-6586-5721UNSPECIFIED
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
Place of Publication: COLLEGE PK
ISSN: 1079-7114
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
TRANSITION; ORDERMultiple languages
Physics, MultidisciplinaryMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/38944


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