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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.