Universität zu Köln

Rezania, Hamed, Langari, Abdollah ORCID: 0000-0002-6971-2087, van Loosdrecht, Paul H. M. ORCID: 0000-0002-3704-9890 and Zotos, Xenophon (2014). Thermal conductivity of anisotropic spin-1/2 two leg ladder: Green's function approach. Eur. Phys. J. B, 87 (8). NEW YORK: SPRINGER. ISSN 1434-6036

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Abstract

We study the thermal transport of a spin-1/2 two leg antiferromagnetic ladder in the direction of legs. The possible effect of spin-orbit coupling and crystalline electric field are investigated in terms of anisotropies in the Heisenberg interactions on both leg and rung couplings. The original spin ladder is mapped to a bosonic model via a bond-operator transformation, where an infinite hard-core repulsion is imposed to constrain one boson occupation per site. The Green's function approach is applied to obtain the energy spectrum of quasi-particle excitations responsible for thermal transport. The thermal conductivity is found to be monotonically decreasing with temperature due to increased scattering among triplet excitations at higher temperatures. A tiny dependence of thermal transport on the anisotropy in the leg direction at low temperatures is observed in contrast to the strong one on the anisotropy along the rung direction, due to the direct effect of the triplet densities. Our results reach asymptotically the ballistic regime of the spin-1/2 Heisenberg chain and present a complement regime for the exact diagonalization data.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Rezania, Hamed UNSPECIFIED UNSPECIFIED UNSPECIFIED Langari, Abdollah UNSPECIFIED orcid.org/0000-0002-6971-2087 UNSPECIFIED van Loosdrecht, Paul H. M. UNSPECIFIED orcid.org/0000-0002-3704-9890 UNSPECIFIED Zotos, Xenophon UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-449914
DOI:	10.1140/epjb/e2014-50018-4
Journal or Publication Title:	Eur. Phys. J. B
Volume:	87
Number:	8
Date:	2014
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1434-6036
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language EXCITATION SPECTRUM; BOUND-STATES; SUPERCONDUCTIVITY; ANTIFERROMAGNETS; FRUSTRATION; ELEMENTARY Multiple languages Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/44991