Instability of a superfluid Bose gas induced by a locked thermal gas in an optical lattice

2005/12/01 by Satoru Konabe, S Konabe, Tetsuro Nikuni +1
Physics and Astronomy · #Bose gas #Cold Atom Physics and Bose-Einstein Condensates #Dissipative system #Instability #Lattice (music) #Mechanical and Optical Resonators #Optical lattice #Quantum, superfluid, helium dynamics #Superfluidity #Thermal #Thermal instability #cond-mat.other

paper · pdf · doi:10.1088/0953-4075/39/10/s10

published as J. Phys. B: At. Mol. Opt. Phys. 39, S101 (2006) · 10 pages, 1 figure

arxiv created 2005/12/01 · openalex publication_date 2006/05/02 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We use a dissipative Gross–Pitaevskii equation derived from the Bose–Hubbard Hamiltonian to study the effect of the thermal component on the stability of a current-carrying superfluid state of a Bose gas in an optical lattice potential. We explicitly show that the superfluid state becomes unstable at certain quasi-momentum of the condensate due to a thermal component which is locked by an optical lattice potential. It is shown that this instability coincides with the Landau instability derived from the GP equation.

Citations

• Dynamics of Trapped Bose Gases at Finite Temperatures
• Josephson Junction Arrays with Bose-Einstein Condensates
• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Role of transverse excitations in the instability of Bose-Einstein condensates moving in optical lattices
• Superfluid-Insulator Transition in a Moving System of Interacting Bosons
• Damping of Bogoliubov excitations in optical lattices
• Effect of Quantum Fluctuations on the Dipolar Motion of Bose-Einstein Condensates in Optical Lattices
• Superfluidity of Bose–Einstein condensate in an optical lattice: Landau–Zener tunnelling and dynamical instability