Static properties and spin dynamics of the ferromagnetic spin-1 Bose gas in a magnetic field

The properties of spin-1 Bose gases with ferromagnetic interactions in the presence of a nonzero magnetic field are studied. The equation of state and thermodynamic quantities are worked out with the help of a mean-field approximation. The phase diagram besides Bose-Einstein condensation contains a...

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Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2005-08, Vol.72 (2), Article 023617
Main Authors: Kis-Szabó, Krisztián, Szépfalusy, Péter, Szirmai, Gergely
Format: Article
Language:English
Subjects:
ATOMIC AND MOLECULAR PHYSICS
BOSE-EINSTEIN CONDENSATION
BOSE-EINSTEIN GAS
BOSONS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
EQUATIONS OF STATE
FERROMAGNETISM
MAGNETIC FIELDS
MAGNETIZATION
MEAN-FIELD THEORY
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
RANDOM PHASE APPROXIMATION
SPIN
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description The properties of spin-1 Bose gases with ferromagnetic interactions in the presence of a nonzero magnetic field are studied. The equation of state and thermodynamic quantities are worked out with the help of a mean-field approximation. The phase diagram besides Bose-Einstein condensation contains a first-order transition where two values of the magnetization coexist. The dynamics is investigated with the help of the random phase approximation. The soft mode corresponding to the critical point of the magnetic phase transition is found to behave like in conventional theory.
doi_str_mv 10.1103/PhysRevA.72.023617
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subjects ATOMIC AND MOLECULAR PHYSICS
BOSE-EINSTEIN CONDENSATION
BOSE-EINSTEIN GAS
BOSONS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
EQUATIONS OF STATE
FERROMAGNETISM
MAGNETIC FIELDS
MAGNETIZATION
MEAN-FIELD THEORY
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
RANDOM PHASE APPROXIMATION
SPIN
title Static properties and spin dynamics of the ferromagnetic spin-1 Bose gas in a magnetic field
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