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Low-energy singlet excitations in spin-1/2 Heisenberg antiferromagnet on square lattice. / Aktersky, A. Yu.; Syromyatnikov, A. V.

в: Journal of Magnetism and Magnetic Materials, Том 405, 2016, стр. 42-47.

Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование

Harvard

Aktersky, AY & Syromyatnikov, AV 2016, 'Low-energy singlet excitations in spin-1/2 Heisenberg antiferromagnet on square lattice', Journal of Magnetism and Magnetic Materials, Том. 405, стр. 42-47. https://doi.org/10.1016/j.jmmm.2015.12.037, https://doi.org/10.1016/j.jmmm.2015.12.037, https://doi.org/10.1016/j.jmmm.2015.12.037, https://doi.org/10.1016/j.jmmm.2015.12.037

APA

Aktersky, A. Y., & Syromyatnikov, A. V. (2016). Low-energy singlet excitations in spin-1/2 Heisenberg antiferromagnet on square lattice. Journal of Magnetism and Magnetic Materials, 405, 42-47. https://doi.org/10.1016/j.jmmm.2015.12.037, https://doi.org/10.1016/j.jmmm.2015.12.037, https://doi.org/10.1016/j.jmmm.2015.12.037, https://doi.org/10.1016/j.jmmm.2015.12.037

Vancouver

Aktersky AY, Syromyatnikov AV. Low-energy singlet excitations in spin-1/2 Heisenberg antiferromagnet on square lattice. Journal of Magnetism and Magnetic Materials. 2016;405:42-47. https://doi.org/10.1016/j.jmmm.2015.12.037, https://doi.org/10.1016/j.jmmm.2015.12.037, https://doi.org/10.1016/j.jmmm.2015.12.037, https://doi.org/10.1016/j.jmmm.2015.12.037

Author

Aktersky, A. Yu. ; Syromyatnikov, A. V. / Low-energy singlet excitations in spin-1/2 Heisenberg antiferromagnet on square lattice. в: Journal of Magnetism and Magnetic Materials. 2016 ; Том 405. стр. 42-47.

BibTeX

@article{9f54e5ed9b804c07b6dc373da7b4ceb6,
title = "Low-energy singlet excitations in spin-1/2 Heisenberg antiferromagnet on square lattice",
abstract = "We present an approach based on a dimer expansion which describes low-energy singlet excitations (singlons) in spin-1/2 Heisenberg antiferromagnet on simple square lattice. An operator ({"}effective Hamiltonian{"}) is constructed whose eigenvalues give the singlon spectrum. The {"}effective Hamiltonian{"} looks like a Hamiltonian of a spin-1/2 magnet in strong external magnetic field and it has a gapped spectrum. It is found that singlet states lie above triplet ones (magnons) in the whole Brillouin zone except in the vicinity of the point (pi, 0), where their energies are slightly smaller. Based on this finding, we suggest that a magnon decay is possible near (pi, 0) into another magnon and a singlon which may contribute to the dip of the magnon spectrum near (pi, 0) and reduce the magnon lifetime. It is pointed out that the singlon-magnon continuum may contribute to the continuum of excitations observed recently near (pi, 0). (C) 2015 Elsevier B.V. All rights reserved.",
keywords = "2 dimension Heisenberg antiferromagnet, Simple square lattice, Magnon decay, MAGNON DISPERSION, ZERO-TEMPERATURE, MODEL, EXPANSIONS, SYSTEMS, SERIES",
author = "Aktersky, {A. Yu.} and Syromyatnikov, {A. V.}",
year = "2016",
doi = "10.1016/j.jmmm.2015.12.037",
language = "English",
volume = "405",
pages = "42--47",
journal = "Journal of Magnetism and Magnetic Materials",
issn = "0304-8853",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Low-energy singlet excitations in spin-1/2 Heisenberg antiferromagnet on square lattice

AU - Aktersky, A. Yu.

AU - Syromyatnikov, A. V.

PY - 2016

Y1 - 2016

N2 - We present an approach based on a dimer expansion which describes low-energy singlet excitations (singlons) in spin-1/2 Heisenberg antiferromagnet on simple square lattice. An operator ("effective Hamiltonian") is constructed whose eigenvalues give the singlon spectrum. The "effective Hamiltonian" looks like a Hamiltonian of a spin-1/2 magnet in strong external magnetic field and it has a gapped spectrum. It is found that singlet states lie above triplet ones (magnons) in the whole Brillouin zone except in the vicinity of the point (pi, 0), where their energies are slightly smaller. Based on this finding, we suggest that a magnon decay is possible near (pi, 0) into another magnon and a singlon which may contribute to the dip of the magnon spectrum near (pi, 0) and reduce the magnon lifetime. It is pointed out that the singlon-magnon continuum may contribute to the continuum of excitations observed recently near (pi, 0). (C) 2015 Elsevier B.V. All rights reserved.

AB - We present an approach based on a dimer expansion which describes low-energy singlet excitations (singlons) in spin-1/2 Heisenberg antiferromagnet on simple square lattice. An operator ("effective Hamiltonian") is constructed whose eigenvalues give the singlon spectrum. The "effective Hamiltonian" looks like a Hamiltonian of a spin-1/2 magnet in strong external magnetic field and it has a gapped spectrum. It is found that singlet states lie above triplet ones (magnons) in the whole Brillouin zone except in the vicinity of the point (pi, 0), where their energies are slightly smaller. Based on this finding, we suggest that a magnon decay is possible near (pi, 0) into another magnon and a singlon which may contribute to the dip of the magnon spectrum near (pi, 0) and reduce the magnon lifetime. It is pointed out that the singlon-magnon continuum may contribute to the continuum of excitations observed recently near (pi, 0). (C) 2015 Elsevier B.V. All rights reserved.

KW - 2 dimension Heisenberg antiferromagnet

KW - Simple square lattice

KW - Magnon decay

KW - MAGNON DISPERSION

KW - ZERO-TEMPERATURE

KW - MODEL

KW - EXPANSIONS

KW - SYSTEMS

KW - SERIES

U2 - 10.1016/j.jmmm.2015.12.037

DO - 10.1016/j.jmmm.2015.12.037

M3 - Article

VL - 405

SP - 42

EP - 47

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

SN - 0304-8853

ER -

ID: 7549895