3 papers
cond-mat.quant-gas2024
Critical velocity for wake vortex generation behind a plate in a superflow
Haruya Kokubo, Kenichi Kasamatsu, Hiromitsu Takeuchi
We study theoretically the critical velocity for quantum vortex generation by a thin plate-shaped obstacle moving through a uniform Bose-Einstein condensate. Our results base…
cond-mat.quant-gas2023
Impact of density inhomogeneity on the critical velocity for vortex shedding in a harmonically trapped Bose-Einstein condensate
Haruya Kokubo, Kenichi Kasamatsu
We report on a numerical study of the critical velocity for creation of quantized vortices by a moving Gaussian obstacle in a trapped Bose-Einstein condensate, modeled by the Gross…
cond-mat.quant-gas2021
Pattern formation of quantum Kelvin-Helmholtz instability in binary superfluids
Haruya Kokubo, Kenichi Kasamatsu, Hiromitsu Takeuchi
We study theoretically nonlinear dynamics induced by shear-flow instability in segregated two-component Bose-Einstein condensates in terms of the Weber number, defined by extending…