Universal spatiotemporal dynamics of spontaneous superfluidity breakdown in the presence of synthetic gauge fields
arXiv:1607.07524 · doi:10.1103/PhysRevA.94.043606
Abstract
According to the famous Kibble-Zurek mechanism (KZM), the universality of spontaneous defect generation in continuous phase transitions (CPTs) can be understood by the critical slowing down. In most CPTs of atomic Bose-Einstein condensates (BECs), the universality of spontaneous defect generations has been explained by the divergent relaxation time associated with the nontrivial gapless Bogoliubov excitations. However, for atomic BECs in synthetic gauge fields, their spontaneous superfluidity breakdown is resulted from the divergent correlation length associated with the zero Landau critical velocity. Here, by considering an atomic BEC ladder subjected to a synthetic magnetic field, we reveal that the spontaneous superfluidity breakdown obeys the KZM. The Kibble-Zurek scalings are derived from the Landau critical velocity which determines the correlation length. In further, the critical exponents are numerically extracted from the critical spatial-temporal dynamics of the bifurcation delay and the spontaneous vortex generation. Our study provides a general way to explore and understand the spontaneous superfluidity breakdown in CPTs from a single-well dispersion to a double-well one, such as, BECs in synthetic gauge fields, spin-orbit coupled BECs, and BECs in shaken optical lattices.
accepted for publication in Phys. Rev. A
References in corpus (18)
- Theory of ultracold Fermi gases
- Single-Atom Resolved Fluorescence Imaging of an Atomic Mott Insulator
- Degenerate Quantum Gases with Spin-Orbit Coupling
- Tunable gauge potential for neutral and spinless particles in driven lattices
- Spontaneous vortices in the formation of Bose-Einstein condensates
- Critical Dynamics of Spontaneous Symmetry Breaking in a Homogeneous Bose gas
- Quench-induced supercurrents in an annular Bose gas
- Superfluid behaviour of a two-dimensional Bose gas
- Critical Behavior of a Trapped Interacting Bose Gas
- Softening of Roton and Phonon Modes in a Bose-Einstein Condensate with Spin-Orbit Coupling
- Vortex and Meissner phases of strongly-interacting bosons on a two-leg ladder
- Staggered-Vortex Superfluid of Ultracold Bosons in an Optical Lattice
- Dynamics of a quantum phase transition in a ferromagnetic Bose-Einstein condensate
- Roton-Maxon Excitation Spectrum of Bose Condensates in a Shaken Optical Lattice
- Vortex quantum creation and winding number scaling in a quenched spinor Bose gas
- Universal far-from-equilibrium Dynamics of a Holographic Superconductor
- Theory of Bosons in two-leg ladders with large magnetic fields
- Strongly Interacting Two-Dimensional Bose Gases