Current jumps in flat-band ladders with Dzyaloshinskii-Moriya interactions

Localized magnons states, due to flat bands in the spectrum, is an intensely studied phenomenon and can be found in many frustrated magnets of different spatial dimensionality. The presence of Dzyaloshinskii-Moriya (DM) interactions may change radically the behavior in such systems. In this context,...

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Detalles Bibliográficos
Autores principales: Acevedo, Santiago Daniel, Pujol, Pierre, Lamas, Carlos Alberto
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2020
Materias:
Física
Ciencias Exactas
Dzyaloshinskii-Moriya interactions
Integrals methods
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125303
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125303
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Ciencias Exactas
Dzyaloshinskii-Moriya interactions
Integrals methods
spellingShingle Física
Ciencias Exactas
Dzyaloshinskii-Moriya interactions
Integrals methods
Acevedo, Santiago Daniel
Pujol, Pierre
Lamas, Carlos Alberto
Current jumps in flat-band ladders with Dzyaloshinskii-Moriya interactions
topic_facet Física
Ciencias Exactas
Dzyaloshinskii-Moriya interactions
Integrals methods
description Localized magnons states, due to flat bands in the spectrum, is an intensely studied phenomenon and can be found in many frustrated magnets of different spatial dimensionality. The presence of Dzyaloshinskii-Moriya (DM) interactions may change radically the behavior in such systems. In this context, we study a paradigmatic example of a one-dimensional frustrated antiferromagnet, the sawtooth chain in the presence of DM interactions. Using both path integrals methods and numerical Density Matrix Renormalization Group, we revisit the physics of localized magnons and determine the consequences of the DM interaction on the ground state. We have studied the spin current behavior, finding three different regimes. First, a Luttinger-liquid regime where the spin current shows a step behavior as a function of parameter D, at a low magnetic field. Increasing the magnetic field, the system is in the Meissner phase at the m = 1/2 plateau, where the spin current is proportional to the DM parameter. Finally, further increasing the magnetic field and for finite D there is a small stiffness regime where the spin current shows, at fixed magnetization, a jump to large values at D = 0, a phenomenon also due to the flat band.
format Articulo
Preprint
author Acevedo, Santiago Daniel
Pujol, Pierre
Lamas, Carlos Alberto
author_facet Acevedo, Santiago Daniel
Pujol, Pierre
Lamas, Carlos Alberto
author_sort Acevedo, Santiago Daniel
title Current jumps in flat-band ladders with Dzyaloshinskii-Moriya interactions
title_short Current jumps in flat-band ladders with Dzyaloshinskii-Moriya interactions
title_full Current jumps in flat-band ladders with Dzyaloshinskii-Moriya interactions
title_fullStr Current jumps in flat-band ladders with Dzyaloshinskii-Moriya interactions
title_full_unstemmed Current jumps in flat-band ladders with Dzyaloshinskii-Moriya interactions
title_sort current jumps in flat-band ladders with dzyaloshinskii-moriya interactions
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/125303
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AT pujolpierre currentjumpsinflatbandladderswithdzyaloshinskiimoriyainteractions
AT lamascarlosalberto currentjumpsinflatbandladderswithdzyaloshinskiimoriyainteractions
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