Finite-temperature phase transitions in quasi-two-dimensional spin-1 Bose gases

Abstract

Recently, the Berezinskii-Kosterlitz-Thouless transition was found to be mediated by half-quantum vortices (HQVs) in two-dimensional (2D) antiferromagnetic Bose gases [Phys. Rev. Lett. 97, 120406 (2006)]. We study the thermal activation of HQVs in the experimentally relevant trapped quasi-2D systems and find that the crossover temperature is shifted upwards if skyrmions are allowed. Above the defect binding temperatures we observe transitions corresponding to the onset of a coherent condensate and a quasi-condensate and discuss the absence of a fragmented condensate.

4 pages, 3 figures; v2 - additional details; v3 - published version, minor changes.

References in corpus (22)

• Many-Body Physics with Ultracold Gases
• Dynamics and statistical mechanics of ultra-cold Bose gases using c-field techniques
• Observation of Half Quantum Vortices in an Exciton-Polariton Condensate
• Fragmentation of Bose-Einstein Condensates
• Dynamical Creation of Fractionalized Vortices and Vortex Lattices
• Fast, Runaway Evaporative Cooling to Bose-Einstein Condensation in Optical Traps
• Vortex proliferation in the Berezinskii-Kosterlitz-Thouless regime on a two-dimensional lattice of Bose-Einstein condensates
• Quantum Phase Transitions and Continuous Observation of Spinor Dynamics in an Antiferromagnetic Condensate
• Sculpting the Vortex State of a Spinor BEC
• Topological defects and the superfluid transition of the $s=1$ spinor condensate in two dimensions
• Kosterlitz-Thouless transition of the quasi two-dimensional trapped Bose gas
• Spinor condensates with a laser-induced quadratic Zeeman effect
• Number Fluctuations and Energy Dissipation in Sodium Spinor Condensates
• Bose-Einstein condensation of trapped interacting spin-1 atoms
• Imaging of spinor gases
• Superfluidity of an interacting trapped quasi-2D Bose gas
• Numerical method for evolving the Projected Gross-Pitaevskii equation
• Critical properties of a trapped interacting Bose gas
• Two point correlations of a trapped interacting Bose gas at finite temperature
• Fractional-flux vortices and spin superfluidity in triplet superconductors
• Coherence properties of spinor condensates at finite temperatures
• Transition region properties of a trapped quasi-two-dimensional degenerate Bose gas

Cited by in corpus (11)

• Spinor Bose-Einstein condensates
• Half-Quantum Vortices in an Antiferromagnetic Spinor Bose-Einstein Condensate
• Crystallized merons and inverted merons in the condensation of spin-1 Bose gases with spin-orbit coupling
• Collisional Dynamics of Half-Quantum Vortices in a Spinor Bose-Einstein Condensate
• Stochastic Projected Gross-Pitaevskii equation for spinor and multi-component condensates
• Many-body physics in the classical-field description of a degenerate Bose gas
• Finite temperature phase diagram of a spin-1 Bose gas
• Fluctuations of spinor Bose-Einstein condensates
• Berezinskii-Kosterlitz-Thouless transitions in a ferromagnetic superfluid: effects of axial magnetization
• Stochastic Gross-Pitaevskii theory for a spin-1 Bose gas: Application to superfluidity in two dimensions
• Phase transitions in dipolar spin-1 Bose gases