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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
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
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
Linking options:
https://www.mathnet.ru/eng/ftt8326 https://www.mathnet.ru/eng/ftt/v62/i9/p1514
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Abstract page: | 44 | Full-text PDF : | 22 |
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