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Fizika Tverdogo Tela, 2020, Volume 62, Issue 9, Pages 1514–1520
DOI: https://doi.org/10.21883/FTT.2020.09.49779.21H (Mi ftt8326) 		 
XXIV International Symposium Nanophysics and Nanoelectronics, Nizhny Novgorod, March 10-13, 2020
Magnetism

Variational model for low-dimensional magnets

Yu. B. Kudasovab, R. V. Kozabaranovab

a Sarov Physics Institute
b Federal State Unitary Enterprise "Russian Federal Nuclear Center — All-Russian Research Institute of Experimental Physics", Sarov, Nizhny Novgorod region
Full-text PDF (163 kB)
DOI: https://doi.org/10.21883/FTT.2020.09.49779.21H
Abstract: The method of nonlocal trial variation function for quantum one-dimensional systems is developed on an example of a spin-1/2 XXZ chain with an alternating magnetic field. A four-site trial wave function for a fermionic representation of the model is constructed. The results obtained using the model with the extended trial wave function show a considerable improvement of accuracy of the ground state energy calculation in the field of critical behavior in comparison with the solutions obtained earlier. The methods for calculating the experimentally observed spin correlation function are considered.
Keywords: one-dimensional quantum magnets, XXZ chain in the alternating magnetic field, variational theory, Gutzwiller method, ground state.
Received: 26.03.2020
Revised: 26.03.2020
Accepted: 02.04.2020
English version:
Physics of the Solid State, 2020, Volume 62, Issue 9, Pages 1678–1684
DOI: https://doi.org/10.1134/S1063783420090176
Bibliographic databases:
Document Type: Article
Language: Russian
Citation: Yu. B. Kudasov, R. V. Kozabaranov, “Variational model for low-dimensional magnets”, Fizika Tverdogo Tela, 62:9 (2020), 1514–1520; Phys. Solid State, 62:9 (2020), 1678–1684
Citation in format AMSBIB
\Bibitem{KudKoz20}
\by Yu.~B.~Kudasov, R.~V.~Kozabaranov
\paper Variational model for low-dimensional magnets
\jour Fizika Tverdogo Tela
\yr 2020
\vol 62
\issue 9
\pages 1514--1520
\mathnet{http://mi.mathnet.ru/ftt8326}
\crossref{https://doi.org/10.21883/FTT.2020.09.49779.21H}
\elib{https://elibrary.ru/item.asp?id=44154239}
\transl
\jour Phys. Solid State
\yr 2020
\vol 62
\issue 9
\pages 1678--1684
\crossref{https://doi.org/10.1134/S1063783420090176}
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