Bond-impurity induced bound states in disordered spin-1/2 ladders

Autores
Arlego, Marcelo José Fabián; Brenig, Wolfram; Cabra, Daniel Carlos; Heidrich-Meisner, Fabian; Honecker, Andreas; Rossini, Gerardo Luis
Año de publicación
2004
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We discuss the effect of weak bond-disorder in two-leg spin ladders on the dispersion relation of the elementary triplet excitations with a particular focus on the appearance of bound states in the spin gap. Both the cases of modified exchange couplings on the rungs and the legs of the ladder are analyzed. Based on a projection on the single-triplet subspace, the single-impurity and small cluster problems are treated analytically in the strong-coupling limit. Numerically, we study the problem of a single impurity in a spin ladder by exact diagonalization to obtain the low-lying excitations. At finite concentrations and to leading order in the inter-rung coupling, we compare the spectra obtained from numerical diagonalization of large systems within the single-triplet subspace with the results of diagrammatic techniques, namely low-concentration and coherent-potential approximations. The contribution of small impurity clusters to the density of states is also discussed.
Facultad de Ciencias Exactas
Materia
Física
Coupling
Physics
Cluster (physics)
Projection (linear algebra)
Bound state
Dispersion relation
Condensed matter physics
Spectral line
Density of states
Quantum mechanics
Spin-½
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/126328
Acceder
id SEDICI_13137a8618a814a44c7beb449ec9f734
oai_identifier_str oai:sedici.unlp.edu.ar:10915/126328
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Bond-impurity induced bound states in disordered spin-1/2 laddersArlego, Marcelo José FabiánBrenig, WolframCabra, Daniel CarlosHeidrich-Meisner, FabianHonecker, AndreasRossini, Gerardo LuisFísicaCouplingPhysicsCluster (physics)Projection (linear algebra)Bound stateDispersion relationCondensed matter physicsSpectral lineDensity of statesQuantum mechanicsSpin-½We discuss the effect of weak bond-disorder in two-leg spin ladders on the dispersion relation of the elementary triplet excitations with a particular focus on the appearance of bound states in the spin gap. Both the cases of modified exchange couplings on the rungs and the legs of the ladder are analyzed. Based on a projection on the single-triplet subspace, the single-impurity and small cluster problems are treated analytically in the strong-coupling limit. Numerically, we study the problem of a single impurity in a spin ladder by exact diagonalization to obtain the low-lying excitations. At finite concentrations and to leading order in the inter-rung coupling, we compare the spectra obtained from numerical diagonalization of large systems within the single-triplet subspace with the results of diagrammatic techniques, namely low-concentration and coherent-potential approximations. The contribution of small impurity clusters to the density of states is also discussed.Facultad de Ciencias Exactas2004-07-30info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/126328enginfo:eu-repo/semantics/altIdentifier/issn/1098-0121info:eu-repo/semantics/altIdentifier/issn/1550-235Xinfo:eu-repo/semantics/altIdentifier/arxiv/cond-mat/0402366info:eu-repo/semantics/altIdentifier/doi/10.1103/physrevb.70.014436info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-15T11:22:15Zoai:sedici.unlp.edu.ar:10915/126328Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-15 11:22:16.071SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Bond-impurity induced bound states in disordered spin-1/2 ladders
title Bond-impurity induced bound states in disordered spin-1/2 ladders
spellingShingle Bond-impurity induced bound states in disordered spin-1/2 ladders
Arlego, Marcelo José Fabián
Física
Coupling
Physics
Cluster (physics)
Projection (linear algebra)
Bound state
Dispersion relation
Condensed matter physics
Spectral line
Density of states
Quantum mechanics
Spin-½
title_short Bond-impurity induced bound states in disordered spin-1/2 ladders
title_full Bond-impurity induced bound states in disordered spin-1/2 ladders
title_fullStr Bond-impurity induced bound states in disordered spin-1/2 ladders
title_full_unstemmed Bond-impurity induced bound states in disordered spin-1/2 ladders
title_sort Bond-impurity induced bound states in disordered spin-1/2 ladders
dc.creator.none.fl_str_mv Arlego, Marcelo José Fabián
Brenig, Wolfram
Cabra, Daniel Carlos
Heidrich-Meisner, Fabian
Honecker, Andreas
Rossini, Gerardo Luis
author Arlego, Marcelo José Fabián
author_facet Arlego, Marcelo José Fabián
Brenig, Wolfram
Cabra, Daniel Carlos
Heidrich-Meisner, Fabian
Honecker, Andreas
Rossini, Gerardo Luis
author_role author
author2 Brenig, Wolfram
Cabra, Daniel Carlos
Heidrich-Meisner, Fabian
Honecker, Andreas
Rossini, Gerardo Luis
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Física
Coupling
Physics
Cluster (physics)
Projection (linear algebra)
Bound state
Dispersion relation
Condensed matter physics
Spectral line
Density of states
Quantum mechanics
Spin-½
topic Física
Coupling
Physics
Cluster (physics)
Projection (linear algebra)
Bound state
Dispersion relation
Condensed matter physics
Spectral line
Density of states
Quantum mechanics
Spin-½
dc.description.none.fl_txt_mv We discuss the effect of weak bond-disorder in two-leg spin ladders on the dispersion relation of the elementary triplet excitations with a particular focus on the appearance of bound states in the spin gap. Both the cases of modified exchange couplings on the rungs and the legs of the ladder are analyzed. Based on a projection on the single-triplet subspace, the single-impurity and small cluster problems are treated analytically in the strong-coupling limit. Numerically, we study the problem of a single impurity in a spin ladder by exact diagonalization to obtain the low-lying excitations. At finite concentrations and to leading order in the inter-rung coupling, we compare the spectra obtained from numerical diagonalization of large systems within the single-triplet subspace with the results of diagrammatic techniques, namely low-concentration and coherent-potential approximations. The contribution of small impurity clusters to the density of states is also discussed.
Facultad de Ciencias Exactas
description We discuss the effect of weak bond-disorder in two-leg spin ladders on the dispersion relation of the elementary triplet excitations with a particular focus on the appearance of bound states in the spin gap. Both the cases of modified exchange couplings on the rungs and the legs of the ladder are analyzed. Based on a projection on the single-triplet subspace, the single-impurity and small cluster problems are treated analytically in the strong-coupling limit. Numerically, we study the problem of a single impurity in a spin ladder by exact diagonalization to obtain the low-lying excitations. At finite concentrations and to leading order in the inter-rung coupling, we compare the spectra obtained from numerical diagonalization of large systems within the single-triplet subspace with the results of diagrammatic techniques, namely low-concentration and coherent-potential approximations. The contribution of small impurity clusters to the density of states is also discussed.
publishDate 2004
dc.date.none.fl_str_mv 2004-07-30
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/126328
url http://sedici.unlp.edu.ar/handle/10915/126328
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/1098-0121
info:eu-repo/semantics/altIdentifier/issn/1550-235X
info:eu-repo/semantics/altIdentifier/arxiv/cond-mat/0402366
info:eu-repo/semantics/altIdentifier/doi/10.1103/physrevb.70.014436
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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score 13.22299

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