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Spin Bose-Metal and Valence Bond Solid Phases in a Spin-1/2 Model with Ring Exchanges on a Four-Leg Triangular Ladder

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. doi:10.1103/PhysRevLett.106.157202.

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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.

Item Type:Article
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Motrunich, Olexei I.0000-0001-8031-0022
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.).
Funding AgencyGrant Number
Alfred P. Sloan FoundationUNSPECIFIED
Issue or Number:15
Classification Code:PACS: 75.10.Kt, 71.10.Hf, 71.10.Pm, 75.10.Jm
Record Number: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
Deposited By: Tony Diaz
Deposited On:03 May 2011 23:15
Last Modified:09 Nov 2021 16:15

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