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.
December 20, 2006
12:00 PM - 1:00 PM, Wednesday
University of Karlsruhe
Geometrical Spin Dephasing in Quantum Dots
We study the relaxation and dephasing of electron spins in quantum
dots that is mediated by spin-orbit coupling, and show that higher
order contributions provide a relaxation mechanism that dominates
in the limit of low magnetic fields. This relaxation is of
geometrical origin. At zero magnetic field the dephasing is due to
a random Berry phase induced by the noise. We further observe that
in the low-field limit the relaxation processes are dominated by
coupling to electron-hole excitations and possibly 1/f noise
rather than by phonons.