Inducing critical phenomena in spin chains through sparse alternating fields

We analyze the phase diagram of the exact ground state (GS) of spin-s chains with ferromagnetic XXZ couplings under n-alternating field configurations, i.e, sparse alternating fields having nodes at n−1 contiguous sites. It is shown that such systems can exhibit a non-trivial magnetic behavior, whic...

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Autores principales: Cerezo de la Roca, Marco Vinicio Sebastián, Rossignoli, Raúl Dante, Canosa, Norma Beatriz, Lamas, Carlos Alberto
Formato: Articulo
Lenguaje:Español
Publicado: 2019
Materias:
Física
ground state (GS)
spin-s chains
sparse alternating fields
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/75184
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-75184
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Física
ground state (GS)
spin-s chains
sparse alternating fields
spellingShingle Física
ground state (GS)
spin-s chains
sparse alternating fields
Cerezo de la Roca, Marco Vinicio Sebastián
Rossignoli, Raúl Dante
Canosa, Norma Beatriz
Lamas, Carlos Alberto
Inducing critical phenomena in spin chains through sparse alternating fields
topic_facet Física
ground state (GS)
spin-s chains
sparse alternating fields
description We analyze the phase diagram of the exact ground state (GS) of spin-s chains with ferromagnetic XXZ couplings under n-alternating field configurations, i.e, sparse alternating fields having nodes at n−1 contiguous sites. It is shown that such systems can exhibit a non-trivial magnetic behavior, which can differ significantly from that of the standard (n = 1) alternating case and enable mechanisms for controlling their magnetic and entanglement properties. The boundary in field space of the fully aligned phase can be determined analytically ∀ n, and shows that it becomes reachable only above a threshold value of the coupling anisotropy Jz/J, which depends on n but is independent of the system size. Below this value the maximum attainable magnetization becomes much smaller. We then show that the GS can exhibit significant magnetization plateaus, persistent for large systems, at which the magnetization per site m obeys the quantization rule 2n(s −m) = integer, consistent with the Oshikawa, Yamanaka and Affleck (OYA) criterion. We also identify the emergence of field induced spin polymerization, which explains the presence of such plateaus. Entanglement and field induced frustration effects are also analyzed.
format Articulo
Articulo
author Cerezo de la Roca, Marco Vinicio Sebastián
Rossignoli, Raúl Dante
Canosa, Norma Beatriz
Lamas, Carlos Alberto
author_facet Cerezo de la Roca, Marco Vinicio Sebastián
Rossignoli, Raúl Dante
Canosa, Norma Beatriz
Lamas, Carlos Alberto
author_sort Cerezo de la Roca, Marco Vinicio Sebastián
title Inducing critical phenomena in spin chains through sparse alternating fields
title_short Inducing critical phenomena in spin chains through sparse alternating fields
title_full Inducing critical phenomena in spin chains through sparse alternating fields
title_fullStr Inducing critical phenomena in spin chains through sparse alternating fields
title_full_unstemmed Inducing critical phenomena in spin chains through sparse alternating fields
title_sort inducing critical phenomena in spin chains through sparse alternating fields
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/75184
work_keys_str_mv AT cerezodelarocamarcoviniciosebastian inducingcriticalphenomenainspinchainsthroughsparsealternatingfields
AT rossignolirauldante inducingcriticalphenomenainspinchainsthroughsparsealternatingfields
AT canosanormabeatriz inducingcriticalphenomenainspinchainsthroughsparsealternatingfields
AT lamascarlosalberto inducingcriticalphenomenainspinchainsthroughsparsealternatingfields
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