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Colloquium: Interacting Flatland Electrons Keep Surprising

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Mansour Shayegan, Princeton University
26 March 2015 from 4:00 PM to 5:00 PM
117 Osmond Laboratory
Contact Name
Jun Zhu
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The high-mobility two-dimensional (2D) electron system at GaAs/AlGaAs interface has provided the testing ground for some of the most exciting many-body phenomena in solid state physics.  Cooled to low temperatures and subjected to a large perpendicular magnetic field, this system has led to the observation of exotic electronic states such as the fractional quantum Hall state and Wigner crystal. My presentation will highlight our latest magneto-transport experiments that probe the physics of interacting 2D electrons (or holes). These include: (1) observation of rare fractional quantum Hall states at even-denominator (1/2) filling factor in 2D hole systems at an unusual crossing of the two lowest Landau levels; (2) tuning and measuring the shape and anisotropy of the Fermi surface of composite fermions, exotic quasi-particles composed of interacting electrons and magnetic flux, and (3) data suggesting that composite fermions themselves can be interacting and form their own fractional quantum Hall and Wigner solid states. I will also discuss a bilayer experiment where the composite fermions in one layer are used to probe an electron Wigner solid in the other layer.


Mansour Shayegan received his B.S. (1979) and Ph.D. (1983) degrees in Electrical Engineering from the Massachusetts Institute of Technology. After a research fellowship at the University in Maryland during 1984-1985, he has been a faculty member in the Department of Electrical Engineering at Princeton University where he teaches physics and electrical engineering courses. Shayegan’s research is in solid state physics with an emphasis on the fabrication of low-dimensional semiconductor structures and measurements of their electronic properties and collective phenomena.