Quantum phases of a frustrated four-leg spin tube

We study the ground state phase diagram of a frustrated spin-1/2 four-leg tube. Using a variety of complementary techniques, namely density matrix renormalization group, exact diagonalization, Schwinger boson mean field theory, quantum Monte-Carlo and series expansion, we explore the parameter space...

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Autores principales: Arlego, Marcelo José Fabián, Brenig, Wolfram, Rahnavard, Yousef, Willenberg, B., Rosales, Héctor Diego, Rossini, Gerardo Luis
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2013
Materias:
Física
Ciencias Exactas
all-antiferromagnetic exchange
four-leg tubes
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/134071
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-134071
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
all-antiferromagnetic exchange
four-leg tubes
spellingShingle Física
Ciencias Exactas
all-antiferromagnetic exchange
four-leg tubes
Arlego, Marcelo José Fabián
Brenig, Wolfram
Rahnavard, Yousef
Willenberg, B.
Rosales, Héctor Diego
Rossini, Gerardo Luis
Quantum phases of a frustrated four-leg spin tube
topic_facet Física
Ciencias Exactas
all-antiferromagnetic exchange
four-leg tubes
description We study the ground state phase diagram of a frustrated spin-1/2 four-leg tube. Using a variety of complementary techniques, namely density matrix renormalization group, exact diagonalization, Schwinger boson mean field theory, quantum Monte-Carlo and series expansion, we explore the parameter space of this model in the regime of all-antiferromagnetic exchange. In contrast to unfrustrated four-leg tubes we uncover a rich phase diagram. Apart from the Luttinger liquid fixed point in the limit of decoupled legs, this comprises several gapped ground states, namely a plaquette, an incommensurate, and an antiferromagnetic quasi spin-2 chain phase. The transitions between these phases are analyzed in terms of total energy and static structure factor calculations and are found to be of (weak) first order. Despite the absence of long range order in the quantum case, remarkable similarities to the classical phase diagram are uncovered, with the exception of the icommensurate regime, which is strongly renormalized by quantum fluctuations. In the limit of large leg exchange the tube exhibits a deconfinement cross-over from gapped magnon like excitations to spinons.
format Articulo
Preprint
author Arlego, Marcelo José Fabián
Brenig, Wolfram
Rahnavard, Yousef
Willenberg, B.
Rosales, Héctor Diego
Rossini, Gerardo Luis
author_facet Arlego, Marcelo José Fabián
Brenig, Wolfram
Rahnavard, Yousef
Willenberg, B.
Rosales, Héctor Diego
Rossini, Gerardo Luis
author_sort Arlego, Marcelo José Fabián
title Quantum phases of a frustrated four-leg spin tube
title_short Quantum phases of a frustrated four-leg spin tube
title_full Quantum phases of a frustrated four-leg spin tube
title_fullStr Quantum phases of a frustrated four-leg spin tube
title_full_unstemmed Quantum phases of a frustrated four-leg spin tube
title_sort quantum phases of a frustrated four-leg spin tube
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/134071
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