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SUMMARY:Fluctuation-Induced Quantum Friction of a Brownian Particle in the
  Anderson Model with Coulomb Interaction
DTSTART:20260423T090000Z
DTEND:20260423T100000Z
DTSTAMP:20260513T183700Z
UID:indico-event-18778@indico.psi.ch
CONTACT:markus.mueller@psi.ch
DESCRIPTION:Speakers: Aleksei Aleshin (Moscow State University)\n\nFluctua
 tion-induced quantum friction\, previously studied for water in nanotubes 
 [1-2]\, is relevant for any quantum dot in an environment. In this talk\, 
 I discuss quantum Brownian motion of an impurity under a 2D electron gas w
 ithin the Newns-Anderson model with Coulomb interaction. A mean-field appr
 oach for a non-equilibrium hybrid system with mechanical and field variabl
 es is developed\, enabling self-consistent analysis of quantum corrections
  to the Langevin dynamics of the impurity's center of mass and their backa
 ction on the friction coefficient. Within this model\, the known friction 
 coefficient due to Coulomb screening [1] is reproduced in first-order pert
 urbation theory. Analysis of charge fluctuations from hopping versus Coulo
 mb shows that zero-order hopping correlations are nonzero and can exceed f
 irst-order Coulomb fluctuations. The approach also yields the pure hopping
  friction force\, which has the interesting feature of vanishing in the ab
 sence of other forces — a result whose explanation is discussed. The dev
 eloped calculation technique can further be employed to analyze the stocha
 stic behavior of particles in detectors during continuous quantum measurem
 ent.\n[1] Kavokine\, N.\, Bocquet\, ML. & Bocquet\, L. Fluctuation-induced
  quantum friction in nanoscale water flows. Nature 602\, 84–90 (2022). 
 https://doi.org/10.1038/s41586-021-04284-7.\n[2] Coquinot\, B.\, Bui\, A.T
 .\, Toquer\, D. et al. Momentum tunnelling between nanoscale liquid flows.
  Nat. Nanotechnol. 20\, 397–403 (2025). https://doi.org/10.1038/s41565-
 024-01842-8\n\nhttps://indico.psi.ch/event/18778/
LOCATION:Teams
URL:https://indico.psi.ch/event/18778/
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