Bosonization study of quantum phase transitions in the one-dimensional asymmetric Hubbard model

Journal Article · Sun Apr 15 00:00:00 EDT 2007 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.75.165111· OSTI ID:20957817

Wang, Z G ^[1]; Chen, Y G ^[1]; Gu, S J ^[2]

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1. Department of Physics, Tongji University, Shanghai 200092 (China)
2. Department of Physics and the Institute of Theoretical Physics, Chinese University of Hong Kong, Hong Kong (China)

The quantum phase transitions in the one-dimensional asymmetric Hubbard model are investigated with the bosonization approach. The conditions for the phase transition from density wave to phase separation, the correlation functions, and their exponents are obtained analytically. Our results show that the difference between the hopping integrals for up- and down-spin electrons is crucial for the occurrence of the phase separation. When the difference is large enough, the phase separation will appear even if the on-site interaction is small.

• OSTI ID: 20957817
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 75, Issue 16; Other Information: DOI: 10.1103/PhysRevB.75.165111; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ASYMMETRY
BOSON EXPANSION
CHARGE DENSITY
CORRELATION FUNCTIONS
DENSITY
ELECTRONS
HUBBARD MODEL
INTEGRALS
ONE-DIMENSIONAL CALCULATIONS
PHASE TRANSFORMATIONS
SPIN