Block, Matthew S. and Sheng, D. N. and Motrunich, Olexei I. and Fisher, Matthew P.A. (2011) Spin Bose-Metal and Valence Bond Solid Phases in a Spin-1/2 Model with Ring Exchanges on a Four-Leg Triangular Ladder. Physical Review Letters, 106 (15). Art. No. 157202. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:20110503-132834831
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Abstract
We study a spin-1/2 system with Heisenberg plus ring exchanges on a four-leg triangular ladder using the density matrix renormalization group and Gutzwiller variational wave functions. Near an isotropic lattice regime, for moderate to large ring exchanges we find a spin Bose-metal phase with a spinon Fermi sea consisting of three partially filled bands. Going away from the triangular towards the square lattice regime, we find a staggered dimer phase with dimers in the transverse direction, while for small ring exchanges the system is in a featureless rung phase. We also discuss parent states and a possible phase diagram in two dimensions.
| Item Type: | Article | ||||||||||||||
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| Additional Information: | © 2011 American Physical Society. Received 7 November 2010; revised manuscript received 28 January 2011; published 12 April 2011. This work was supported by NSF Grants No. DMR- 0529399 (M. S. B. and M. P. A. F.), DMR-0611562, 0906816 and MRI-0958596 (D. N. S.), DMR-0907145 (O. I. M), and the A. P. Sloan Foundation (O. I. M.). | ||||||||||||||
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| Classification Code: | PACS: 75.10.Kt, 71.10.Hf, 71.10.Pm, 75.10.Jm | ||||||||||||||
| Record Number: | CaltechAUTHORS:20110503-132834831 | ||||||||||||||
| Persistent URL: | http://resolver.caltech.edu/CaltechAUTHORS:20110503-132834831 | ||||||||||||||
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| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||
| ID Code: | 23533 | ||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||
| Deposited By: | Tony Diaz | ||||||||||||||
| Deposited On: | 03 May 2011 23:15 | ||||||||||||||
| Last Modified: | 26 Dec 2012 13:12 |
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