UPCommons està en procés de migració del dia 10 fins al 14 Juliol. L’autentificació està deshabilitada per evitar canvis durant aquesta migració.
Browsing by Author "Guenther, Nils Eric"
Now showing items 1-5 of 5
-
Bose polarons at finite temperature and strong coupling
Guenther, Nils Eric; Massignan, Pietro Alberto; Lewenstein, Maciej; Bruun, Georg (2018-02-01)
Article
Open AccessA mobile impurity coupled to a weakly interacting Bose gas, a Bose polaron, displays several interesting effects. While a single attractive quasiparticle is known to exist at zero temperature, we show here that the spectrum ... -
Dynamics of quantum mixtures
Guenther, Nils Eric (Universitat Politècnica de Catalunya, 2021-09-08)
Doctoral thesis
Open AccessAt sufficiently low temperatures, fluids of bosonic particles may undergo a phase transition, below which a Bose-Einstein condensate (BEC) forms. The BEC is one of the most fundamental concepts in many-body quantum physics ... -
Mobile impurity in a Bose-Einstein condensate and the orthogonality catastrophe
Guenther, Nils Eric; Schmidt, Richard; Bruun, Georg M.; Gurarie, Victor; Massignan, Pietro Alberto (American Physical Society, 2021-01-01)
Article
Open AccessWe analyze the properties of an impurity in a dilute Bose-Einstein condensate (BEC). First the quasiparticle residue of a static impurity in an ideal BEC is shown to vanish with increasing particle number as a stretched ... -
Quantized superfluid vortex dynamics on cylindrical surfaces and planar annuli
Guenther, Nils Eric; Massignan, Pietro Alberto; Fetter, Alexander L. (AMER PHYSICAL SOC, 2017-12-06)
Article
Open AccessSuperfluid vortex dynamics on an infinite cylinder differs significantly from that on a plane. The requirement that a condensate wave function be single valued upon once encircling the cylinder means that such a single ... -
Superfluid vortex dynamics on a torus and other toroidal surfaces of revolution
Guenther, Nils Eric; Massignan, Pietro Alberto; Fetter, Alexander L. (American Physical Society (APS), 2020-05-04)
Article
Open AccessThe superfluid flow velocity is proportional to the gradient of the phase of the superfluid order parameter, leading to the quantization of circulation around a vortex core. In this work, we study the dynamics of a ...