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SU(2)-invariant Majorana spin liquid with stable parton Fermi surfaces in an exactly solvable model

Lai, Hsin-Hua and Motrunich, Olexei I. (2011) SU(2)-invariant Majorana spin liquid with stable parton Fermi surfaces in an exactly solvable model. Physical Review B, 84 (8). Art. No. 085141. ISSN 1098-0121. doi:10.1103/PhysRevB.84.085141.

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We construct an exactly solvable spin-orbital model on a decorated square lattice that realizes an SU(2)-invariant Majorana spin liquid with parton Fermi surfaces, of the kind discussed recently by Biswas et al. [Phys. Rev. B. 83 245131 (2011)]. We find power-law spin correlations as well as power-law spin-nematic correlations with the same dominant 1/|r|^3 envelope. The model is solvable also in the presence of Zeeman magnetic field. One fermion species carries S^z = 0 quantum number and its Fermi surface is not altered in the field, while the Fermi surfaces of the other species evolve and can disappear. In particular, we find an interesting half magnetization plateau phase in which spin excitations are gapful while there remain spinless gapless excitations that still produce metal-like thermal properties. In the fully magnetized phase, the model reduces to the one proposed by Baskaran et al. [e-print arXiv:0908.1614 (to be published)] in terms of the orbital degrees of freedom.

Item Type:Article
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Motrunich, Olexei I.0000-0001-8031-0022
Additional Information:© 2011 American Physical Society. Received 8 June 2011; published 30 August 2011. This research was supported by the National Science Foundation through Grant No. DMR-0907145 and by the A. P. Sloan Foundation.
Funding AgencyGrant Number
Alfred P. Sloan FoundationUNSPECIFIED
Issue or Number:8
Classification Code:PACS: 75.10.Jm, 75.10.Kt
Record Number:CaltechAUTHORS:20110921-141634254
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:25391
Deposited By: Tony Diaz
Deposited On:14 Oct 2011 16:49
Last Modified:09 Nov 2021 16:32

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