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Shubnikov-de-Haas Oscillations in topological and non-topological electron systems

Grant number: 20/00841-9
Support type:Regular Research Grants
Duration: July 01, 2020 - June 30, 2022
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:José Carlos Egues de Menezes
Grantee:José Carlos Egues de Menezes
Home Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

Here we present research plans to investigate Shubnikov-de-Haas oscillations in a number of quantum well systems ranging from ordinary two-dimensional electron gases in InAs, GaAs single quantum wells with competing Rashba and Dresselhaus couplings to topological 2D structures such as InAs/GaSb double wells where topological insulating behavior has been predicted. Our approach relies on obtaining the density of states of two dimensional systems in the presence of quantizing magnetic fields via trace formulas which we then combine with a phenomenological (Drude type) semiclassical approach to determine the magnetoresistence of the system. We also envision applying our approach to investigate quantum oscillations in anomalous quantum Hall systems (Chern insulators) and Weyl semimetals. Our proposal is motivated by some recent experimental results involving SdH oscillations in topological insulators and Rashba-Dresselhaus coupled systems: Beukman \textit{et al.}, Phys. Rev. \textbf{96}, 241401(R) (2017) and Cimpoiasu \textit{et al.} J. Appl. Phys. \textbf{126}, 075704 (2019). This proposal is also an outgrowth or our own recent collaborative works. (AU)