Quantum Lunch Location:
T-Division Conference Room, TA-3,
Building 123, Room 121
Quantum Institute: Visitor Schedule
The Quantum Lunch is regularly held on Thursdays in the Theoretical Division Conference Room, TA-3, Building 123, Room 121.
For more information, contact Diego Dalvit.
May 18, 2006
University of Central Florida
Berry Phase Oscillations of the Kondo Effect in Single-molecule Magnets
In this talk we will show that it is possible to topologically
induce or quench the Kondo resonance in the conductance of a single-molecule
magnet strongly coupled to metallic leads. This can be achieved by
applying a magnetic field perpendicular to the molecule easy axis and
works for both full- and half-integer spin cases, provided that S>1/2.
The effect is caused by the Berry phase interference between two quantum
tunneling paths of the molecule's spin. We have calculated the renormalized
Berry phase oscillations of the Kondo peaks as a function of the transverse
magnetic field as well as the conductance of the molecule by means of
the poor man's scaling method. We propose to use a new variety of the
single-molecule magnet Ni4 for the experimental observation of this