Tuesday, August 2, 2011, 11:00 am — Bldg. 480 conference room
The semiconductor two-dimensional electronic system (2DES) is host to a variety of unique phenomena whose discovery resulted in two sets of Nobel Prizes. For 30 years, experimenters attempted to measure the single particle spectrum of this system, as this fundamental physical quantity reveals an enormous amount of information about the ground state and the interactions that are present. However, until recently measurements have been thwarted by a variety of experimental difficulties that distorted the data and greatly limited resolution.
I will discuss a novel technique, time domain capacitance spectroscopy, which eliminates these problems and present measurements of the single particle spectrum of a 2D system in a Gallium Arsenide quantum well. These beautiful spectra provide a uniquely intuitive view of the integer and fractional quantum Hall effects and shed light on a variety of phenomena.
By using electrostatic gates, it is possible to further restrict the motion of electrons in 2DES, creating a zero dimensional quantum dot.
Several variants of these quantum dots are promising candidates for quantum computation. I will briefly discuss efforts towards demonstrating universal one and two qubit quantum gates in GaAs S-T qubits that are currently under way at Harvard.
Hosted by: Ivan Bozovic
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