Variational study of triangular lattice spin-1/2 model with ring exchanges and spin liquid state in kappa-(ET)2Cu2(CN)3
- Creators
-
Motrunich, Olexei I.
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.
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.Attached Files
Published - MOTprb05b.pdf
Files
| Name | Size | Download all |
|---|---|---|
|
md5:fec0911ca0a7dda8a4fe5c331e67a79d
|
116.4 kB | Preview Download |
Additional details
- Eprint ID
- 7118
- Resolver ID
- CaltechAUTHORS:MOTprb05b
- DMR-0213282
- NSF
- DMR-0201069
- NSF
- PHY-9907949
- NSF
- Created
-
2007-01-09Created from EPrint's datestamp field
- Updated
-
2021-11-08Created from EPrint's last_modified field