10 citations · 28 across the 8 of their papers we have counts for
7 papers · 1 filter
Anomalous tunneling as a low-energy theorem for Nambu-Goldstone modes
Keisuke Fujii, Daichi Kagamihara, Masaru Hongo
Anomalous tunneling refers to the phenomenon in which the transmission coefficient through a potential barrier approaches unity as the energy of an incident particle or quasipartic…
Effective theory of surface oscillations in self-bound superfluid droplets
Jun Mitsuhashi, Keisuke Fujii, Masaru Hongo
We investigate the low-energy dynamics of small-amplitude surface oscillations of spherical superfluid droplets in vacuum. Starting from the effective field theory of superfluid ph…
Few is different: deciphering many-body dynamics in mesoscopic quantum gases
Juergen Berges, Sandra Brandstetter, Jasmine Brewer +27
Emergent macroscopic descriptions of matter, such as hydrodynamics, are central to our description of complex physical systems across a wide spectrum of energy scales. The conventi…
Hydrodynamic Attractor in Ultracold Atoms
Keisuke Fujii, Tilman Enss
The hydrodynamic attractor is a concept that describes universal equilibration behavior in which systems lose microscopic details before hydrodynamics becomes applicable. We propos…
Complex-valued in-medium potential between heavy impurities in ultracold atoms
Yukinao Akamatsu, Shimpei Endo, Keisuke Fujii +1
We formulate the induced potential in a finite temperature cold atomic medium between two heavy impurities, or polarons, which is shown to be \textit{complex-valued} in general. Th…
Stable-fixed-point description of square-pattern formation in driven two-dimensional Bose-Einstein condensates
Keisuke Fujii, Sarah L. Görlitz, Nikolas Liebster +5
We investigate pattern formation in two-dimensional Bose-Einstein condensates (BECs) caused by periodic driving of the interatomic interaction. We show that this modulation generic…
Observation of pattern stabilization in a driven superfluid
Nikolas Liebster, Marius Sparn, Elinor Kath +6
The formation of patterns in driven systems has been studied extensively, and their emergence can be connected to a fine balance of instabilities and stabilization mechanisms. Whil…