45 citations · 322 across the 48 of their papers we have counts for
28 papers · 1 filter
Transverse Field Dependence of the Ground State in the Z2 Bose-Hubbard Model
Yuma Watanabe, Shohei Watabe, Tetsuro Nikuni
The study of interaction between the particle and lattice degrees of freedom is one of the central interests in the quantum many-body systems. The Z2 Bose-Hubbard model has been pr…
Emergence of nonequilibrium Lieb excitations in periodically driven strongly interacting bosons
Hoshu Hiyane, Giedrius Žlabys, Thomas Busch +1
We study the exact nonequilibrium spectral function of a gas of strongly correlated Tonks-Girardeau bosons subjected to a strong periodic drive. Utilizing the theory of Floquet spe…
Collective excitations of a Bose-condensed gas: Fate of second sound in the crossover regime between hydrodynamic and collisionless regimes
Hoshu Hiyane, Shohei Watabe, Tetsuro Nikuni
We develop the moment method for Bose-Einstein condensates (BECs) at finite temperatures that enable us to study collective sound modes from the hydrodynamic to the collisionless r…
Observing phase jumps of solitons in Bose-Einstein condensates
Kazuma Ohi, Shohei Watabe, Tetsuro Nikuni
The phase difference of the macroscopic wave function is a unique structure of the soliton in an atomic Bose--Einstein condensate (BEC). However, experiments on ultracold atoms so…
Analysis of shape change of droplet in dipolar Bose-Hubbard model
Kazuhiro Tamura, Shohei Watabe, Tetsuro Nikuni
The long-range and anisotropic nature of the dipolar interaction provides the so-called supersolid phases in Bose-Einstein condensates (BECs) in an optical lattice. However, in a c…
Propagation of phase-imprinted solitons from superfluid core to Mott-insulator shell and superfluid shell
Yuma Watanabe, Shohei Watabe, Tetsuro Nikuni
We study phase-imprinted solitons of ultracold bosons in an optical lattice with a harmonic trap, which shows the superfluid (SF) and Mott-insulator (MI) shell structures. The earl…