Mean-field and stability analyses of two-dimensional flowing soft-core bosons modeling a supersolid

M Kunimi, Y Kato - Physical Review B—Condensed Matter and Materials …, 2012 - APS
The soft-core boson system is one of the simplest models of supersolids, which have both off-
diagonal long-range order (Bose–Einstein condensation) and diagonal long-range order …

Quantum phase slips in one-dimensional superfluids in a periodic potential

I Danshita, A Polkovnikov - Physical Review A—Atomic, Molecular, and Optical …, 2012 - APS
We study the decay of superflow of a one-dimensional (1D) superfluid in the presence of a
periodic potential. In 1D, superflow at zero temperature can decay via quantum nucleation of …

Dynamical instabilities of Bose-Einstein condensates at the band edge in one-dimensional optical lattices

AJ Ferris, MJ Davis, RW Geursen, PB Blakie… - Physical Review A …, 2008 - APS
We present a joint theoretical and experimental study of the dynamical instability of a Bose—
Einstein condensate at the band edge of a one-dimensional optical lattice. The instability …

Stability of Bose-Einstein condensates in a Kronig-Penney potential

I Danshita, S Tsuchiya - Physical Review A—Atomic, Molecular, and Optical …, 2007 - APS
We study the stability of Bose-Einstein condensates with superfluid currents in a one-
dimensional periodic potential. By using the Kronig-Penney model, the condensate and …

Collective modes and superflow instabilities of strongly correlated Fermi superfluids

R Ganesh, A Paramekanti, AA Burkov - Physical Review A—Atomic, Molecular …, 2009 - APS
We study the superfluid phase of the one-band attractive Hubbard model of fermions as a
prototype of a strongly correlated s-wave fermion superfluid on a lattice. We show that the …

Probing few and many-body physics in a planar Bose gas: Atom-dimer interactions and zero-temperature superfluid fraction

C Maury - 2023 - theses.hal.science
Dimensionality plays an important role in physical systems. A gas of ultracold atoms
confined in a two-dimensional geometry has very different thermodynamic properties from …

Detecting the superfluid critical momentum of Bose gases in optical lattices through dipole oscillations

T Saito, I Danshita, T Ozaki, T Nikuni - Physical Review A—Atomic, Molecular …, 2012 - APS
We study the stability of superflow of Bose gases in optical lattices by analyzing the Bose-
Hubbard model within the Gutzwiller mean-field approximation. We calculate the excitation …

Superfluidity in Bose-Hubbard circuits

G Arwas, D Cohen - Physical Review B, 2017 - APS
A semiclassical theory is provided for the metastability regime diagram of atomtronic
superfluid circuits. Such circuits typically exhibit high-dimensional chaos, and nonlinear …

Heavily Damped Motion of One-Dimensional Bose Gases in an Optical Lattice

I Danshita, CW Clark - Physical review letters, 2009 - APS
We study the dynamics of strongly correlated one-dimensional Bose gases in a combined
harmonic and optical lattice potential subjected to sudden displacement of the confining …

Stability of Bose-Einstein condensates in two-dimensional optical lattices

Z Chen, B Wu - Physical Review A—Atomic, Molecular, and Optical …, 2010 - APS
Both Landau instability and dynamical instability of Bose-Einstein condensates in moving
two-dimensional optical lattices are investigated numerically and analytically. Phase …