SU(2)-invariant Majorana spin liquid with stable parton Fermi surfaces in an exactly solvable model
- Creators
- Lai, Hsin-Hua
- Motrunich, Olexei I.
Abstract
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.
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.Attached Files
Published - Lai2011p15805Phys_Rev_B.pdf
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Additional details
- Eprint ID
- 25391
- Resolver ID
- CaltechAUTHORS:20110921-141634254
- DMR-0907145
- NSF
- Alfred P. Sloan Foundation
- Created
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2011-10-14Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field