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SUMMARY:Kondo physics in multilevel quantum dots. - Prof. David Logan\, Th
 eoretical Chemistry\, Oxford University
DTSTART:20090521T131500Z
DTEND:20090521T141500Z
UID:TALK15570@talks.cam.ac.uk
CONTACT:Dr Jonathan Keeling
DESCRIPTION:The low-energy behaviour of quantum dots coupled to metallic l
 eads is\ncommonly associated with a single 'active' dot level\, and hence 
 with the\nspin-1/2 Kondo efect. But this is not ubiquitous: if several dot
  levels\nare relevant to charge transport\, higher spin Kondo efects may a
 rise\,\nand have been observed experimentally. This talk will discuss a ra
 ther\ngeneral model for a two-level correlated quantum dot\, studied large
 ly\nvia RG. Particular consideration will be given to the spin-1 and\nspin
 -1/2 Kondo regimes which occur on sweeping the dot levels through\nthe Fer
 mi level by tuning a gate voltage\; to the nature of the resultant\nquantu
 m phase transition between the regimes arising in a two-lead\,\none-channe
 l setup\; and to comparison to experiment. Time permitting\, I\nmay also d
 iscuss some aspects of SU(4) Kondo physics in carbon nanotube\nquantum dot
 s.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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