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题名: Zero-modes and thermodynamics of disordered spin-1/2 ladders
作者: Gogolin, AO ;  Nersesyan, AA ;  Tsvelik, AM ;  Yu, L
刊名: NUCLEAR PHYSICS B
出版日期: 1999
卷号: 540, 期号:3, 页码:705-730
关键词: LOW-TEMPERATURE PROPERTIES ;  NONMAGNETIC IMPURITIES ;  FIELD-THEORY ;  CHAINS ;  LIQUID ;  GAP ;  SUPERCONDUCTIVITY ;  SUPERSYMMETRY ;  SRCU2O3 ;  SYSTEMS
学科分类: Physics
通讯作者: Gogolin, AO , Univ London Imperial Coll Sci Technol & Med, Dept Math, 180 Queens Gate, London SW7 2BZ, England.
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
英文摘要: 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.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000078676900007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13183
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
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.
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