
#1
Sep1413, 01:00 PM

P: 1

It is well known that backscattering of surface electrons in topological insulators is prohibited due to Kramer's degeneracy theorem as long as Time Reversal Symmetry is not broken by magnetic field or magnetic impurities.
I would like to know what effect this has on scattering length and scattering times of a topological insulator. Should they not be very large in absence of magnetic impurities; the logic being that electrons will not be scattered. Or even in the case when backscattering is absent, can electrons still be scattered, for example by angles not equal to 180 °. 


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