September 5, 2014 at 11:00 pm

Physics Colloquium: Single Spintronics—Electrical Manipulation of Single Spins in Solid, Sept. 5

Michael E. Flatté

Michael E. Flatté

The Physics & Astronomy Colloquium Series presents Michael E. Flatté of the University of Iowa on “Single Spintronics—electrical manipulation of single spins in solids” on Friday, Sept. 5, at 4:10 p.m. in Walter 245.

Recent observations of the coupling between pairs of magnetic atoms in a solid, the hysteresis curves of individual magnetic atoms weakly coupled to a magnet, and microsecond nonequilibrium single-spin lifetimes at room temperature suggest that measurements of individual spins in solids will soon be routine. Control of individual spins on the nanoscale poses additional challenges, however, for strong, localized time-dependent magnetic fields can only be generated in special samples. Indirect methods of controlling the spins through electrical means offer a promising path to single-spin control, as these approaches take advantage of spin-orbit couplings induced by the very large electric fields near atomic nuclei, and as the control electrical field can be confined to a much smaller region of space than a time-varying magnetic field. Prospects for electrical manipulation of single spins will be described, including the different regimes expected for half-integer spins versus integer spins, as well as for spins bound to ions versus those confined to quantum dots.

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