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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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.
|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.).|
|Classification Code:||PACS: 75.10.Kt, 71.10.Hf, 71.10.Pm, 75.10.Jm|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||03 May 2011 23:15|
|Last Modified:||26 Dec 2012 13:12|
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