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13 papers · 1 filter
Matter-wave dark solitons in a double-well potential
Ryoko Ichihara, Ippei Danshita, Tetsuro Nikuni
We study stability of the first excited state of quasi-one-dimensional Bose-Einstein condensates in a double-well potential, which is called "-state". The density notch in the $…
Stability of superfluid Fermi gases in optical lattices
Yoshihiro Yunomae, Ippei Danshita, Daisuke Yamamoto +2
Critical velocities of superfluid Fermi gases in optical lattices are theoretically investigated across the BCS-BEC crossover. We calculate the excitation spectra in the presence o…
Hypocenter interval statistics between successive earthquakes in the two-dimensional Burridge-Knopoff model
Tomohiro Hasumi
We study statistical properties of spatial distances between successive earthquakes, the so-called hypocenter intervals, produced by a two-dimensional (2D) Burridge-Knopoff model i…
Condition for emergence of complex eigenvalues in the Bogoliubov-de Gennes equations
Y. Nakamura, M. Mine, M. Okumura +1
The condition for the appearance of dynamical instability of the Bose-condensed system, characterized by the emergence of complex eigenvalues in the Bogoliubov-de Gennes equations,…
Quantum Field Theoretical Analysis on Unstable Behavior of Bose-Einstein Condensates in Optical Lattices
K. Kobayashi, M. Mine, M. Okumura +1
We study the dynamics of Bose-Einstein condensates flowing in optical lattices on the basis of quantum field theory. For such a system, a Bose-Einstein condensate shows a unstable…
Quantum phases of bosons in double-well optical lattices
Ippei Danshita, James E. Williams, Carlos A. R. Sa de Melo +1
We study the superfluid to Mott insulator transition of bosons in a two-legged ladder optical lattice, of a type accessible in current experiments on double-well optical lattices.…