SU(2)-Invariant Spin Liquids on the Triangular Lattice with Spinful Majorana Excitations

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SU(2)-Invariant Spin Liquids on the Triangular Lattice with Spinful Majorana Excitations

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Title: SU(2)-Invariant Spin Liquids on the Triangular Lattice with Spinful Majorana Excitations
Author: Biswas, Rudro Rana; Fu, Liang; Sachdev, Subir; Laumann, Christopher Richard

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Citation: Biswas, Rudro, Fu, Liang, Laumann, Chris, and Subir Sachdev. 2011. SU(2)-invariant spin liquids on the triangular lattice with spinful Majorana excitations. Phys. Rev. B 83(24): 245131.
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Abstract: We describe a new class of spin liquids with global SU(2) spin rotation symmetry in spin 1/2 systems on the triangular lattice, which have real Majorana fermion excitations carrying spin S = 1. The simplest translationally-invariant mean-field state on the triangular lattice breaks time-reversal symmetry and is stable to fluctuations. It generically possesses gapless excitations along 3 Fermi lines in the Brillouin zone. These intersect at a single point where the excitations scale with a dynamic exponent z = 3. An external magnetic field has no orbital coupling to the SU(2) spin rotation-invariant fermion bilinears that can give rise to a transverse thermal conductivity, thus leading to the absence of a thermal Hall effect. The Zeeman coupling is found to gap out two-thirds of the z = 3 excitations near the intersection point and this leads to a suppression of the low temperature specific heat, the spin susceptibility and the Wilson ratio. We also compute physical properties in the presence of weak disorder and discuss possible connections to recent experiments on organic insulators.
Published Version: doi:10.1103/PhysRevB.83.245131
Other Sources: http://prb.aps.org/abstract/PRB/v83/i24/e245131
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:7974160

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  • FAS Scholarly Articles [6463]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

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