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SUMMARY:Adiabatic transport through interacting quantum dots - Dr Janine S
 plettstoesser (Institut fur Theoretische Physik A\, Physikzentrum\, RWTH A
 achen\, Germany)
DTSTART:20100607T131500Z
DTEND:20100607T141500Z
UID:TALK24778@talks.cam.ac.uk
CONTACT:afw24
DESCRIPTION:Adiabatic transport (such as pumping) through a quantum dot re
 veals interesting properties due to quantum coherence and Coulomb interact
 ion effects\, which can not directly be found from a study of the time-ind
 ependent system. In this seminar I want to discuss our latest studies of q
 uantum dot systems subject to Coulomb interaction\, modulated by time-depe
 ndent fields:\n\n* The time-dependent non-linear transport current through
  an interacting quantum dot in the single-electron tunneling regime (SET) 
 combines the study of pumping with the nonlinear bias regime. We propose a
 n adiabatic transport spectroscopy where a ``time-averaged stability diagr
 am'' probes interactions\, tunnel asymmetries and changes in the ground st
 ate spin-degeneracy.\n\n* I will also present results on adiabatic pumping
  through a double dot  coupled  to normal metal or ferromagnetic contacts.
  Tunnel-induced renormalization effects due to charge fluctuations  and  t
 unneling through thermally excited states can play an important role here.
  In the presence of ferromagnetic leads\, these effects can lead to an inv
 erted spin-valve effect or  even to a diverging tunneling magneto-resistan
 ce.\n\n* Finally we compared the transient response of a quantum dot with 
 strong Coulomb interaction to a fast change in the gate potential\, to the
  stationary ac-response to a slow harmonic variation of the gate potential
 . The difference\, not present in the classical case\, arrises from higher
 -order tunneling processes.\n
LOCATION:Mott Seminar Room
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