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Quantum Institute: Visitor ScheduleThe 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 Alexander Shnirman, Geometrical Spin Dephasing in Quantum Dots AbstractWe 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. |