7 citations · 23 across the 5 of their papers we have counts for
4 papers · 1 filter
Are Quasiparticles and Phonons Identical in Bose--Einstein Condensates?
Kazumasa Tsutsui, Yusuke Kato, Takafumi Kita
We study an interacting spinless Bose-Einstein condensate to clarify theoretically whether the spectra of its quasiparticles (one-particle excitations) and collective modes (two-pa…
Lifetime of Single-Particle Excitations in a Dilute Bose-Einstein Condensate at Zero Temperature
Kazumasa Tsutsui, Takafumi Kita
We study the lifetime of single-particle excitations in a dilute homogeneous Bose-Einstein condensate at zero temperature based on a self-consistent perturbation expansion of satis…
Ground-State Energy and Condensate Density of a Dilute Bose Gas Revisited
Kazumasa Tsutsui, Takafumi Kita
The ground-state energy per particle and condensate density of a dilute Bose gas are studied with a self-consistent perturbation expansion satisfying the Hugenholtz-Pin…
Studying Superfluid Transition of a Dilute Bose Gas by Conserving Approximations
K. Tsutsui, T. Kita
We consider the Bose-Einstein transition of homogeneous weakly interacting spin-0 particles based on the normal-state Phi-derivable approximation. Self-consistent calculations of G…