Physics Colloquium - Matthew J. Benesh, Ph.D.

DateOctober 18, 2013Time3:35 - 4:35 pm
DescriptionAcoustic Transport in Low-Dimensional Electron Systems Advances in semiconductor material growth have provided the means to investigate electron systems confined to fewer than three dimensions. Certain III-V materials, such as GaAs and AlGaAs, are ideal for creating a perfectly two-dimensional electron gas (2DEG). Through the suitable application of surface voltages, a 2DEG may be further constrained to define one-dimensional quantum wires and zerodimensional quantum dots, as well as intricate combinations of the two. These systems have proven indispensable to the study of charge transport dynamics at the quantum level. A novel approach to induce charge transport relies on the piezoelectric qualities of GaAs. By applying a surface acoustic wave (SAW) to a GaAs/AlGaAs system, a traveling electrostatic wave is generated which is able to interact with an embedded 2DEG. When combined with surface voltages, a SAW is capable of capturing electrons and transporting them at the acoustic velocity of 2800m/s. This technique has a wide range of applications, from single-photon sources to quantum computation. In this talk I will introduce the basic concepts and motivation behind acoustoelectric transport, as well as key developments in the field. This will be followed by a discussion of recent investigations of the dynamics of SAW-transport, including loss mechanisms and the quantum-mechanical characteristics of singleelectron transport.
PublisherBaylor Sciences Building
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