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Heisenberg antiferromagnet
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Using the functional integral method for the Heisenberg antiferromagnetic spin chain with the added Dzyaloshinskii–Moriya interaction in the longitudinal magnetic field, we find an expression for the free energy of the spin chain via spin fluctuations.
8p
vispiderman
15-06-2023
5
2
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We study the S=1 anisotropic antiferomagnetic Heisenberg model on a square lattice for all temperatures using the Popov-Fedotov representation of spin operators. In this representation the constraint of single particle site occupation is rigorously fulfilled by introducing an imaginary valued chemical potential.
11p
vimoskva2711
02-01-2020
14
1
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We study magnetic properties of ordered phases in the Heisenberg model on a nonBravais lattice by means of a Popov - Fedotov trick, which takes into account a rigorous constraint of a single occupancy. We derive the magnetization and the free energy using sadle point approximation in the functional integral formalism. We illustrate the application of the Popov – Fedotov approach to the Heisenberg antiferromagnet on a honeycomb lattice.
10p
viaphrodite2711
14-10-2019
7
0
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We study the magnetic ordered phases of the spin-1/2 Heisenberg antiferromagnetic model with nearest J1 and next nearest neighbor J2 exchange interactions on the square lattice using fermionic representation of spin operators within Popov-Fedotov approach.The unphysical states are eliminated on each site by introducing an imaginary chemical potential. Working in local coordinate system for every site we investigate the different ordered phases in dependence on exchange parameters. At T = 0 we recover the conventional spin wave results.
8p
thuyliebe
09-10-2018
28
0
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