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Variational study of triangular lattice spin-1/2 model with ring exchanges and spin liquid state in kappa-(ET)2Cu2(CN)3

Motrunich, Olexei I. (2005) Variational study of triangular lattice spin-1/2 model with ring exchanges and spin liquid state in kappa-(ET)2Cu2(CN)3. Physical Review B, 72 (4). Art. No. 045105. ISSN 1098-0121. http://resolver.caltech.edu/CaltechAUTHORS:MOTprb05b

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Abstract

We study triangular lattice spin-1/2 system with antiferromagnetic Heisenberg and ring exchanges using variational approach focusing on possible realization of spin-liquid states. Trial spin liquid wave functions are obtained by Gutzwiller projection of fermionic mean-field states and their energetics is compared against magnetically ordered trial states. We find that in a range of the ring exchange coupling upon destroying the antiferromagnetic order, the best such spin liquid state is essentially a Gutzwiller-projected Fermi sea state. We propose this spin liquid with a spinon Fermi surface as a candidate for the nonmagnetic insulating phase observed in the organic compound kappa-(ET)2Cu2(CN)3, and describe some experimental consequences of this proposal.


Item Type:Article
Additional Information:©2005 The American Physical Society (Received 28 January 2005; published 5 July 2005) The author has benefited from many useful discussions with M.P.A. Fisher, V. Galitski, P. Nikolic, and A. Vishwanath, and is especially grateful to T. Senthil for motivating this problem and sharing many insights throughout the course of the study. This work was started at MIT and was supported by NSF grants Nos. DMR-0213282 and DMR-0201069. The work at KITP was supported through NSF grant No. PHY-9907949.
Subject Keywords:antiferromagnetic materials; wave functions; Heisenberg model; Fermi surface; Fermi liquid; exchange interactions (electron); spin dynamics; variational techniques; organic compounds
Record Number:CaltechAUTHORS:MOTprb05b
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:MOTprb05b
Alternative URL:http://dx.doi.org/10.1103/PhysRevB.72.045105
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7118
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:09 Jan 2007
Last Modified:26 Dec 2012 09:29

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