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Topological Surface States - Tunnelling and Patterning

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If you have a question about this talk, please contact Dr Joanna Waldie.

Topological insulators (TIs) and their protected spin-momentum locked surface states (TSSs) have generated a great deal of interest within the field in the last few years. Since the discovery of Bi2Se3 as a TI with a Dirac cone at the surface, many questions have arisen about further understanding the properties of these states.

This project asks two questions: how do surface states tunnel and how can they be patterned?

We aim to use momentum-resolved tunnelling spectroscopy to map out the dispersion relation of the TSS , and to measure whether spin is preserved during the tunnelling process. We also investigate ways to pattern the TSS : this is protected with time-reversal symmetry, so using the magnetic proximity effect to break the TSS in selected regions seems to be a promising approach.

I will outline the theory and principles behind these questions and the research plan we have devised to tackle this and present our preliminary results.

This talk is part of the Semiconductor Physics Group Seminars series.

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