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Transcript
Jaroslav Fabian (University Regensburg):
"Topologically protected states in semiconductor
quantum wells"
Abstract: In certain classes of semiconductors the electronic band structure allows
for the formation of spin-polarized
edge states even without the presence of a magnetic field. These edge states are so
called topologically
protected against impurity scattering, as long as the scattering is elastic and timereversal symmetry preserving.
In the presence of a magnetic field the time reversal is broken and the edge states
develop to the conventional
quantum Hall edge states as the magnetic field increases. I will review this new field
of condensed matter physics
and give specific examples of our own calculations of the magnetization of these
topological edge states.