P-A Colloquium: Probing Exotic States of Interacting 2D Electron Systems
Speaker: Mansour Shayegan, Princeton University
Title: Probing Exotic States of Interacting 2D Electron Systems
Refreshments at 3:30 pm in 1400 BPS.
Date: Thu, 11 Oct 2018, 4:10 pm – 5:10 pm
Location: 1415 BPS Bldg.
There has been a surge of recent interest in the physics of interacting 2D electrons in a large perpendicular magnetic field when they occupy a half-filled Landau level. The long ago proposed composite fermion (CF) picture, in which two magnetic flux quanta are bound to each electron to form a CF, explains many properties of the system. These include the compressible (metallic) behavior of the 2D system at filling factor ν = ½, the existence of a Fermi contour with a well-defined Fermi wave vector, and the presence of fractional quantum Hall states as the filling deviates from ν = ½. In this talk, I will highlight the results of several recent experiments, performed on very high mobility 2D electron and hole systems confined to GaAs/AlGaAs quantum wells, that probe CFs via measuring the geometric resonance of their cyclotron orbit diameter with the period of an imposed, unidirectional density modulation.