Physics – Condensed Matter
Scientific paper
1994-09-08
Physics
Condensed Matter
Plain TeX 9 pages, 1 uuencoded figure appended. HU-HA-9401
Scientific paper
The past few years have produced major advances in our understanding of the quantum Hall effects---quantized and unquantized. Theories based on a mathematical transformation, where the electrons are replaced by a set of fermions interacting with a Chern-Simons gauge field, have been useful for explaining and predicting observations at even-denominator filling fractions where quantized Hall plateaus are not observed, as well as for giving new insight into the most prominent fractional quantized Hall states at odd-denominator fractions. Other theoretical approaches have led to important advances in our understanding of edge-excitations for systems in a fractional quantized Hall state, of phases and phase transitions in bilayer systems, of tunneling phenomena in the quantum Hall regimes, and of disorder-induced transitions between ``neighboring'' quantum Hall plateaus. Some highlights of these developments will be reviewed.
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