Seminarium Fizyki Ciała Stałego

SnTe is a semiconductor compound belonging to a new group of topological matter called Topological Crystalline Insulators (TCI).In my talk, I will present the results of magnetotransport measurements on macroscopic samples and nano-structures made of SnTe/PbTe heterojunctions and CdTe/SnTe/CdTe quantum wells.The classical conductivity of macroscopic samples is described using the Mobility Spectrum Analysis (MSA), which shows that the electron-like and hole-like maxima observed in the mobility spectra are associated with single-carrier transport in a topological band and originate from the concave and convex parts of the constant energy surface on the (001) crystallographic plane.Then, I will describe the low-temperature electrical properties of 6- and 8-probe nano-structures significantly different from macroscopic samples.In particular, large conductance fluctuations and the quenching of the Hall effect are observed.These unusual results are interpreted as related to the transport of topological carriers, whose energy spectrum was quantized due to dimensionality reduction.Finally, I will provide evidence of the hydrodynamic flow of a viscous fermionic liquid in narrow SnTe channels, possibly related to forming a flat 1D energy band.Presented results are partially published in D. Śnieżek et al., Phys. Rev. B 107, 045103 (2023).UwagaSeminarium w trybie HybrydowymFaculty of Physics room 0.06link to remote mode:https://zoom.us/j/7218838148szczegóły patrz instrukcja :instrukcja: (pdf file)AttentionThe seminar in the Hybrid modeFaculty of Physics room 0.06for details see instruction :instruction: (pdf file)