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SUMMARY:Adiabatic reaction forces in mesoscopic systems - Silvia Viola Kus
 minskiy\, Freie Universität Berlin
DTSTART:20131205T141500Z
DTEND:20131205T151500Z
UID:TALK47428@talks.cam.ac.uk
CONTACT:Gareth Conduit
DESCRIPTION:Nanoelectromechanical systems are characterized by an intimate
  connection between electronic and mechanical degrees of freedom. Due to t
 he nanoscopic scale\, current flowing through the system noticeably impact
 s the vibrational dynamics of the device\, complementing the effect of the
  vibrational modes on the electronic dynamics. In this talk I describe our
  recently developed formalism\, in which we employ the scattering matrix a
 pproach to quantum transport to describe the current-induced forces acting
  on the mechanical degrees of freedom of an out-of-equilibrium nanoelectro
 mechanical system. These forces control the Langevin dynamics of the mecha
 nical modes. Specifically\, we derive expressions for the (typically nonco
 nservative) mean force\, for the (possibly negative) damping force\, an ef
 fective "Lorentz" force which exists even for time reversal invariant syst
 ems\, and the fluctuating Langevin force originating from Nyquist and shot
  noise of the current flow. In a more general setting\, these forces can b
 e interpreted as reaction forces acting over slow classical degrees of fre
 edom coupled to a quantum-mechanical scattering system\, and our results e
 xtend previous work on adiabatic reaction forces for closed quantum system
 s. I will also go over some very recent results in which we describe the d
 ecay of the Loschmidt Echo of the out-of-equilibrium quantum-mechanical sc
 attering system\,  in terms of the fluctuations and dissipation of the sys
 tem.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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