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Quantum phase transition in an atomic Bose gas near a Feshbach resonance
- Source :
- Physical Review B. 70
- Publication Year :
- 2004
- Publisher :
- American Physical Society (APS), 2004.
-
Abstract
- We study the quantum phase transition in an atomic Bose gas near a Feshbach resonance in terms of the renormalization group. This quantum phase transition is characterized by an Ising order parameter. We show that in the low temperature regime where the quantum fluctuations dominate the low-energy physics this phase transition is of first order because of the coupling between the Ising order parameter and the Goldstone mode existing in the bosonic superfluid. However, when the thermal fluctuations become important, the phase transition turns into the second order one, which belongs to the three-dimensional Ising universality class. We also calculate the damping rate of the collective mode in the phase with only a molecular Bose-Einstein condensate near the second-order transition line, which can serve as an experimental signature of the second-order transition.<br />8 pages, 2 figures, published version in Phys. Rev. B
- Subjects :
- Condensed Matter::Quantum Gases
Quantum phase transition
Physics
Phase transition
Statistical Mechanics (cond-mat.stat-mech)
Condensed matter physics
Bose gas
Condensed Matter - Superconductivity
FOS: Physical sciences
Quantum phases
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
law.invention
Superconductivity (cond-mat.supr-con)
law
Quantum mechanics
Quantum critical point
Ising model
Feshbach resonance
Condensed Matter - Statistical Mechanics
Bose–Einstein condensate
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 70
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi.dedup.....33494e563b219bd8edaff12c6a686f5b