Akademickie Centrum Materiałów i Nanotechnologii AGH zaprasza na wirtualne seminarium, które odbędzie się 26 listopada 2020 r. o godz. 14.00.
Referat pt. Quantum Oscillations in Magnetotransport of Topological Insulators wygłosi dr Maciej Chrobak (WFiIS i ACMiN AGH).
Electronic structure of topological insulators is characterized by the simultaneous occurrence of gapped bulk states and massless Dirac fermions at the surface. The latter are protected by time-reversal symmetry, which leads to lack of backscattering of massless fermions on impurities. It results in high efficiency of spin pumping as well as anomalous magnetotransport, both being very promising from the application point of view (e.g. in modern electronic devices). As an introduction, I will describe our 3He/4He dilution refrigerator “Triton” offering magnetotransport and specific heat measurements at low temperatures down to 10 mK and at external magnetic field up to 14 T. In the main part of the talk, I will present systematic studies of magnetoresistance in Bi2Se3 and Bi2Te3 single crystals undoped and doped with magnetic and nonmagnetic metals. The results reveal that low-level doping influences the frequency and amplitude of Shubnikov-de Haas oscillations which reflect the modification of the electronic structure.
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