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Hermanns, M. and Trebst, S. (2014). Quantum spin liquid with a Majorana Fermi surface on the three-dimensional hyperoctagon lattice. Phys. Rev. B, 89 (23). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

Motivated by the recent synthesis of beta-Li2IrO3-a spin-orbit entangled j = 1/2 Mott insulator with a three-dimensional lattice structure of the Ir4+ ions-we consider generalizations of the Kitaev model believed to capture some of the microscopic interactions between the iridium moments on various trivalent lattice structures in three spatial dimensions. Of particular interest is the so-called hyperoctagon lattice-the premedial lattice of the hyperkagome lattice, for which the ground state is a gapless quantum spin liquid where the gapless Majorana modes form an extended two-dimensional Majorana Fermi surface. We demonstrate that this Majorana Fermi surface is inherently protected by lattice symmetries and discuss possible instabilities. We thus provide the first example of an analytically tractable microscopic model of interacting SU(2) spin-1/2 degrees of freedom in three spatial dimensions that harbors a spin liquid with a two-dimensional spinon Fermi surface.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hermanns, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Trebst, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-436004
DOI:	10.1103/PhysRevB.89.235102
Journal or Publication Title:	Phys. Rev. B
Volume:	89
Number:	23
Date:	2014
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 DENSITY; STATE; PHASE; HEAT Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/43600