Department of Physics, Engineering Physics & Astronomy

Department of Physics, Engineering Physics & Astronomy
Department of Physics, Engineering Physics & Astronomy

Spin Transport via Dynamic Quantum Dots

James Stotz
Paul-Drude-Institute, Berlin

Date: Thursday, July 28, 2005
Time: 11:30 AM
Location: Stirling C


The field of spintronics is rapidly progressing with the objective of exploiting the electron's spin, rather than its charge, in solid state electronics to provide faster, more efficient devices and, eventually, quantum computers. To achieve these objectives, basic materials and devices are required that can efficiently transport and manipulate spins. Previous studies in semiconductors have typically focussed on either the transport of spins with little control of their microscopic movement or the use of quantum dots to enhance the spin lifetime at the expense of limiting transport

I will present my recent work regarding the unique system of dynamic quantum dots (DQDs), which allows the transport and manipulation of electron spins while retaining their confinement. DQDs are created by the combination of static potentials with a dynamic piezoelectric potential generated by surface acoustic waves. When spin carriers are photogenerated in a quantum well, they are confined within the DQDs and coherently transported over long distances at repetition rates in the gigahertz range. I will also discuss the control of spin relaxation mechanisms and the manipulation of the spin vector in a magnetic field, which leads to possibilities for future spintronic devices based on DQDs.

James Stotz is a short-listed candidate for the recently-advertised position in Experimental Condensed Matter Physics.

Refreshments will be available after the talk.