2024-03-28T11:03:53Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/2183532020-09-29T08:36:25Zcom_10261_2855com_10261_4col_10261_2857
DIGITAL.CSIC
author
Rønning, Jonas
author
Skaugen, Audun
author
Hernández-García, Emilio
author
López, Cristóbal
author
Angheluta, Luiza
funder
Research Council of Norway
funder
European Commission
funder
Ministerio de Economía y Competitividad (España)
funder
Ministerio de Ciencia, Innovación y Universidades (España)
funder
Agencia Estatal de Investigación (España)
orcid
Hernández-García, Emilio [0000-0002-9568-8287]
orcid
López, Cristóbal [0000-0002-3445-4284]
orcid
Angheluta, Luiza [0000-0001-7231-6694]
2020-08-21T08:22:52Z
2020-08-21T08:22:52Z
2020-07-17
New Journal of Physics 22: 073018 (2020)
http://hdl.handle.net/10261/218353
10.1088/1367-2630/ab95de
1367-2630
http://dx.doi.org/10.13039/501100000780http://dx.doi.org/10.13039/501100011033http://dx.doi.org/10.13039/501100003329
We study the hydrodynamic forces acting on a small impurity moving in a two-dimensional Bose–Einstein condensate at non-zero temperature. The condensate is modelled by the damped-Gross Pitaevskii (dGPE) equation and the impurity by a Gaussian repulsive potential coupled to the condensate. For weak coupling, we obtain analytical expressions for the forces acting on the impurity, and compare them with those computed through direct numerical simulations of the dGPE and with the corresponding expressions for classical forces. For non-steady flows, there is a time-dependent force dominated by inertial effects and which has a correspondence in the Maxey–Riley theory for particles in classical fluids. In the steady-state regime, the force is dominated by a self-induced drag. Unlike at zero temperature, where the drag force vanishes below a critical velocity, at low temperatures the impurity experiences a net drag even at small velocities, as a consequence of the energy dissipation through interactions of the condensate with the thermal cloud. This dissipative force due to thermal drag is similar to the classical Stokes' drag. There is still a critical velocity above which steady-state drag is dominated by acoustic excitations and behaves non-monotonically with impurity's speed.
eng
openAccess
Classical analogies for the force acting on an impurity in a Bose–Einstein condensate
artículo
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URL
https://digital.csic.es/bitstream/10261/218353/1/Ronning_2020_New_J._Phys.pdf
File
MD5
b23611ea88f1fcc4f255bc3324382590
1942394
application/pdf
Ronning_2020_New_J._Phys.pdf