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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.
Zero-modes and thermodynamics of disordered spin-1/2 ladders
Source PublicationNUCLEAR PHYSICS B
KeywordLow-temperature Properties Nonmagnetic Impurities Field-theory Chains Liquid Gap Superconductivity Supersymmetry Srcu2o3 Systems
AbstractThe 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.
1999
ISSN0550-3213
Volume540Issue:3Pages:705-730
Subject AreaPhysics
Indexed BySCI
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Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/13183
Collection理论物理所科研产出_SCI论文
Corresponding AuthorGogolin, AO , Univ London Imperial Coll Sci Technol & Med, Dept Math, 180 Queens Gate, London SW7 2BZ, England.
Recommended Citation
GB/T 7714
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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