Quantum phases in the frustrated Heisenberg model on the bilayer honeycomb lattice

We use a combination of analytical and numerical techniques to study the phase diagram of the frustrated Heisenberg model on the bilayer honeycomb lattice. Using the Schwinger-boson description of the spin operators followed by a mean-field decoupling, the magnetic phase diagram is studied as a func...

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Detalles Bibliográficos
Autores principales: Lamas, Carlos Alberto, Arlego, Marcelo José Fabián, Zhang, Hao
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2014
Materias:
Ciencias Exactas
Física
materia condensada
electrones
Heisenberg model
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/38687
http://arxiv.org/abs/1312.6324
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-38687
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
materia condensada
electrones
Heisenberg model
spellingShingle Ciencias Exactas
Física
materia condensada
electrones
Heisenberg model
Lamas, Carlos Alberto
Arlego, Marcelo José Fabián
Zhang, Hao
Quantum phases in the frustrated Heisenberg model on the bilayer honeycomb lattice
topic_facet Ciencias Exactas
Física
materia condensada
electrones
Heisenberg model
description We use a combination of analytical and numerical techniques to study the phase diagram of the frustrated Heisenberg model on the bilayer honeycomb lattice. Using the Schwinger-boson description of the spin operators followed by a mean-field decoupling, the magnetic phase diagram is studied as a function of the frustration coupling J2 and the interlayer coupling J⊥. The presence of both magnetically ordered and disordered phases is investigated by means of the evaluation of ground-state energy, spin gap, local magnetization, and spin-spin correlations. We observe a phase with a spin gap and short-range Néel correlations that survives for nonzero next-nearest-neighbor interaction and interlayer coupling. Furthermore, we detect signatures of a reentrant behavior in the melting of the Néel phase and symmetry restoring when the system undergoes a transition from an on-layer nematic valence-bond crystal phase to an interlayer valence-bond crystal phase. We complement our work with exact diagonalization on small clusters and dimer-series expansion calculations, together with a linear spin-wave approach to study the phase diagram as a function of the spin S, the frustration, and the interlayer couplings.
format Articulo
Preprint
author Lamas, Carlos Alberto
Arlego, Marcelo José Fabián
Zhang, Hao
author_facet Lamas, Carlos Alberto
Arlego, Marcelo José Fabián
Zhang, Hao
author_sort Lamas, Carlos Alberto
title Quantum phases in the frustrated Heisenberg model on the bilayer honeycomb lattice
title_short Quantum phases in the frustrated Heisenberg model on the bilayer honeycomb lattice
title_full Quantum phases in the frustrated Heisenberg model on the bilayer honeycomb lattice
title_fullStr Quantum phases in the frustrated Heisenberg model on the bilayer honeycomb lattice
title_full_unstemmed Quantum phases in the frustrated Heisenberg model on the bilayer honeycomb lattice
title_sort quantum phases in the frustrated heisenberg model on the bilayer honeycomb lattice
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/38687
http://arxiv.org/abs/1312.6324
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AT zhanghao quantumphasesinthefrustratedheisenbergmodelonthebilayerhoneycomblattice
bdutipo_str Repositorios
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