7 papers
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…
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…
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…
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…
Gauge theory for topological waves in continuum fluids with odd viscosity
Keisuke Fujii, Yuto Ashida
We consider two-dimensional continuum fluids with odd viscosity under a chiral body force. The chiral body force makes the low-energy excitation spectrum of the fluids gapped, and…