Seminarium Oddziału Badań Magnetyków
Microsoft Teams
Transport Measurement in HgTe/(Hg,Cd)Te 2D Topological Insulator
dr Magdalena Majewicz
Oddział Badań Magnetyków
Seminarium odbędzie się zdalnie w aplikacji Microsoft Teams. W celu wzięcia udziału w wydarzeniu należy dołączyć do zespołu Seminarium OBM.Można do niego dołączyć na stałe przy użyciu kodu dostępu ol7omod (dotyczy to osób posiadających konto w domenie intibs.pl, pozostałe osoby proszę o kontakt z dr. hab. Adamem Pikulem ()). Do zespołu można dołączyć od godz. 13:15.
Streszczenie:
The topic of topological insulators has become very popular in last few years. Attractiveness of the field is caused by unique properties of those systems. For example, the spin-momentum locking may open applications in spintronics.
In case of two-dimensional topological insulators theory predicts that one-dimensional dissipationless conducting edge states are formed. It means that conductance occurs through spin-polarized edge channels, while the rest of the sample remains electrically insulating. Unfortunately, it turned out that experimental observation of quantized edge conductance is extremely difficult. Up to now, the measured channel resistances are at best only approximately equal to the quantized values and only for short edge channels.
The main goal of my PhD project was systematic investigation of individual edge channel resistances in microstructures made of mercury telluride quantum wells and determining their dependence on channel length. During the presentation I will focus on the measurement method suitable for investigation of edge transport in 2D topological insulators. The most appropriate geometries of the structures and measurement configurations will be described. Then I will explain how resistance of individual edge channel can be extracted from available data. Finally experimental data obtained for microstructures with channel lengths in the range between 1 to 20 μm will be shown.
