Series expansion analysis of a frustrated four-spin tube

We study the magnetism of a frustrated four-leg spin-1/2 ladder with transverse periodic boundary conditions: the frustrated four-spin tube (FFST). Using a combination of series expansion (SE), based on the continuous unitary transformation method and density-matrix renormalization group (DMRG) we a...

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Autores principales: Arlego, Marcelo José Fabián, Brenig, Wolfram
Formato: Articulo
Lenguaje:Inglés
Publicado: 2011
Materias:
Física
Magnetismo
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83687
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83687
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Magnetismo
spellingShingle Física
Magnetismo
Arlego, Marcelo José Fabián
Brenig, Wolfram
Series expansion analysis of a frustrated four-spin tube
topic_facet Física
Magnetismo
description We study the magnetism of a frustrated four-leg spin-1/2 ladder with transverse periodic boundary conditions: the frustrated four-spin tube (FFST). Using a combination of series expansion (SE), based on the continuous unitary transformation method and density-matrix renormalization group (DMRG) we analyze the ground-state, the one-, and the two-particle excitations in the regime of strong rung coupling. We find several marked differences of the FFST with respect to standard two-leg ladders. First, we show that frustration destabilizes the spin-gap phase of the FFST, which is adiabatically connected to the limit of decoupled rung singlets, leading to a first-order quantum phase transition at finite interrung coupling. Second, we show that apart from the well-known triplon branch of spin ladders, the FFST sustains additional elementary excitations, including a singlon and additional triplons. Finally, we find that in the two-particle sector, the FFST exhibits collective (anti)bound states similar to two-leg ladders, however, with a different ordering of the spin-quantum numbers. We show that frustration has significant impact on the FFST leading to a flattening of the ground-state energy landscape, a mass-enhancement of the excitations, and to a relative enhancement of the (anti)binding strength. Where possible, we use DMRG to benchmark the findings from our SE calculations, showing excellent agreement.
format Articulo
Articulo
author Arlego, Marcelo José Fabián
Brenig, Wolfram
author_facet Arlego, Marcelo José Fabián
Brenig, Wolfram
author_sort Arlego, Marcelo José Fabián
title Series expansion analysis of a frustrated four-spin tube
title_short Series expansion analysis of a frustrated four-spin tube
title_full Series expansion analysis of a frustrated four-spin tube
title_fullStr Series expansion analysis of a frustrated four-spin tube
title_full_unstemmed Series expansion analysis of a frustrated four-spin tube
title_sort series expansion analysis of a frustrated four-spin tube
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/83687
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