Impurity scattering in a helical metal - Probing the electronic surface states of a topological insulator – Niels Bohr Institute - University of Copenhagen

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Impurity scattering in a helical metal - Probing the electronic surface states of a topological insulator

On a helical metal, where the electrons spin is locked to its momentum, quantities accessible to spin-(un)resolved STM measuremens, such as the modifications of the local density of states (LDOS) are studied. The distinct influence of resepectively a scalar, a classical magnetic and a quantum magnetic impurity on the LDOS is calculated. These are shown to give rise to distinguishable features in an LDOS measurement.

Master's thesis defence by Michael Bjerngaard