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Zero-modes and thermodynamics of disordered spin-1/2 ladders
Gogolin, AO; Nersesyan, AA; Tsvelik, AM; Yu, L; Gogolin, AO , Univ London Imperial Coll Sci Technol & Med, Dept Math, 180 Queens Gate, London SW7 2BZ, England.
1999
发表期刊NUCLEAR PHYSICS B
ISSN0550-3213
卷号540期号:3页码:705-730
摘要The influence of non-magnetic doping on the thermodynamic properties of two-leg S = 1/2 spin ladders is studied in this paper. It is shown that, for a weak interchain coupling, the problem can be mapped onto a model of random mass Dirac (Majorana) fermions. We investigate in detail the structure of the fermionic states localized at an individual mass kink (zero-modes) in the framework of a generalized Dirac model. The low-temperature thermodynamic properties are dominated by these zero-modes. We use the single-fermion density of states, known to exhibit the Dyson singularity in the zero-energy limit, to construct the thermodynamics of the spin ladder, In particular, we find that the magnetic susceptibility chi diverges at T --> 0 as 1/Tln(2)(1/T), and the specific heat behaves as C proportional to 1/ln(3)(1/T). The predictions on magnetic susceptibility are consistent with the most recent results of quantum Monte Carlo simulations on doped ladders with randomly distributed impurities. We also calculate the average staggered magnetic susceptibility induced in the system by such defects. (C) 1999 Elsevier Science B.V.
部门归属Univ London Imperial Coll Sci Technol & Med, Dept Math, London SW7 2BZ, England; Int Ctr Theoret Phys, I-34100 Trieste, Italy; Inst Phys, GE-380077 Tbilisi, Rep of Georgia; Univ Oxford, Dept Phys, Oxford OX1 3NP, England; Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China
关键词Low-temperature Properties Nonmagnetic Impurities Field-theory Chains Liquid Gap Superconductivity Supersymmetry Srcu2o3 Systems
学科领域Physics
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收录类别SCI
WOS记录号WOS:000078676900007
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被引频次:19[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/13183
专题理论物理所1978-2010年知识产出
通讯作者Gogolin, AO , Univ London Imperial Coll Sci Technol & Med, Dept Math, 180 Queens Gate, London SW7 2BZ, England.
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Gogolin, AO,Nersesyan, AA,Tsvelik, AM,et al. Zero-modes and thermodynamics of disordered spin-1/2 ladders[J]. NUCLEAR PHYSICS B,1999,540(3):705-730.
APA Gogolin, AO,Nersesyan, AA,Tsvelik, AM,Yu, L,&Gogolin, AO , Univ London Imperial Coll Sci Technol & Med, Dept Math, 180 Queens Gate, London SW7 2BZ, England..(1999).Zero-modes and thermodynamics of disordered spin-1/2 ladders.NUCLEAR PHYSICS B,540(3),705-730.
MLA Gogolin, AO,et al."Zero-modes and thermodynamics of disordered spin-1/2 ladders".NUCLEAR PHYSICS B 540.3(1999):705-730.
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