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APS » Journals » Phys. Rev. Lett. » Volume 92 » Issue 23
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Phys. Rev. Lett. 92, 236401 (2004) [4 pages]

Ground State Phases of the Half-Filled One-Dimensional Extended Hubbard Model

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Anders W. Sandvik1,2,3, Leon Balents3, and David K. Campbell1,4
1Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA
2Department of Physics, Åbo Akademi University, Porthansgatan 3, FIN-20500 Turku, Finland
3Department of Physics, University of California, Santa Barbara, California 93106, USA
4Department of Electrical and Computer Engineering, Boston University, 44 Cummington Street, Boston, Massachusetts 02215, USA

Received 23 January 2004; published 7 June 2004

Using quantum Monte Carlo simulations, results of a strong-coupling expansion, and Luttinger liquid theory, we determine quantitatively the ground state phase diagram of the one-dimensional extended Hubbard model with on-site and nearest-neighbor repulsions U and V. We show that spin frustration stabilizes a bond-ordered (dimerized) state for U≈V/2 up to U/t≈9, where t is the nearest-neighbor hopping. The transition from the dimerized state to the staggered charge-density-wave state for large V/U is continuous for U≲5.5 and first order for higher U.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.236401
DOI:
10.1103/PhysRevLett.92.236401
PACS:
71.10.Fd, 71.10.Hf, 71.10.Pm, 71.30.+h
 
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