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Numerical Study of Luttinger Liquid Regime of Two-Leg Hubbard Ladders |
| CHENG Kuan1;LIU Yu-Liang2 |
| 1Department of Physics, Tsinghua University, Beijing 100084
2Center for Advanced Study, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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CHENG Kuan, LIU Yu-Liang 2005 Chin. Phys. Lett. 22 2349-2352 |
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Abstract We investigate two-leg Hubbard ladders in the Luttinger liquid regime by the density-matrix renormalization group method. Applicability of the bond concept in this region is discussed in a quantitative comparison of power-law decay exponents, energy components and anti-bond occupations between ladders and chains. The interaction between bond and anti-bond bands induced by finite Hubbard repulsion U is emphasized by our numerical results. Our quantitative results are useful for the justification of the validity of various analytical approaches.
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| Keywords:
71.10.Fd
71.10.Pm
74.20.Mn
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Published: 01 September 2005
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| PACS: |
71.10.Fd
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(Lattice fermion models (Hubbard model, etc.))
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71.10.Pm
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(Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.))
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74.20.Mn
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(Nonconventional mechanisms)
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