95 citations · 224 across the 5 of their papers we have counts for
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Mobile impurity in a Bose-Einstein condensate and the orthogonality catastrophe
Nils-Eric Guenther, Richard Schmidt, Georg M. Bruun +2
We 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 in…
Superfluid vortex dynamics on a torus and other toroidal surfaces of revolution
Nils-Eric Guenther, Pietro Massignan, Alexander L. Fetter
The 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 thi…
Quantized superfluid vortex dynamics on cylindrical surfaces and planar annuli
Nils-Eric Guenther, Pietro Massignan, Alexander L. Fetter
Superfluid 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…
Bose polarons at finite temperature and strong coupling
Nils-Eric Guenther, Pietro Massignan, Maciej Lewenstein +1
The temperature dependence of a mobile impurity in a dilute Bose gas, the Bose polaron, is investigated for wide a range of impurity-bath interactions. Using a diagrammatic resumma…