Quantum Oscillations in 2d - interaction effects (dHvA to FQHE)

Philip Stamp

University of British Columbia, Pacific Institute of Theoretical Physics, Physics and Astronomy, Vancouver, Canada

Interactions in 2D conductors have a dramatic effect on the system in a magnetic field, leading ultimately to the Fracional Quantum Hall effect (FQHE). However when the field is not so strong, one sees dHvA oscillations. How does the standard dHvA effect break down and ultimately give the FQHE? And why does conventional dHvA theory work for some quasi-2D systems? This talk gives partial answers to these questions, and also says something about the dHvA oscillations found recently in underdoped YBCO.

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