Quantum Ising-like spin-j model with multipole-multipole interactions: Second order mean-field approach

Carla Buzano and Mario Rasetti

Physica A: Statistical Mechanics and its Applications, 1984, vol. 129, issue 1, 165-183

Abstract: A quantum Ising-like spin-j model, characterized by arbitrary multipole-multipole interactions as well as external fields, is proposed and analyzed. A thorough discussion of the algebraic properties of the dynamical variables (which belong to SU(2j+1)) is performed, whereby by the application of an improved version of the mean-field theory (which has the usual mean-field theory as its zeroeth order approximation) an explicit expression for the free energy is derived.

Date: 1984
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:129:y:1984:i:1:p:165-183

DOI: 10.1016/0378-4371(84)90026-8

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