Efficient method for analyzing magneto-oscillations of two-dimensional spin-orbit coupled electron gases

Author(s)

Gramizadeh, Hamed ; Candido, Denis R. ; Manolescu, Andrei ; Egues, J. Carlos ; Erlingsson, Sigurdur I.

• Document type: Journal article
• Source: PHYSICAL REVIEW B; v. 109, n. 11, p. 9-pg., 2024-03-11.

Abstract

Magneto-oscillations in two-dimensional systems with spin-orbit interaction (SOI) are typically characterized by fast Shubnikov-de Haas (SdH) oscillations and slower spin-orbit-related beatings. The characterization of the full SdH oscillatory behavior in systems with both SOI and Zeeman coupling requires a time-consuming diagonalization of large matrices for many magnetic field values. By using the Poisson summation formula, we can explicitly separate the density of states into fast and slow oscillations, which determine the corresponding fast and slow parts of the magneto-oscillations. We introduce an efficient scheme of partial diagonalization of our Hamiltonian, where only states close to the Fermi energy are needed to obtain the SdH oscillations, thus reducing the required computational time. This allows an efficient method for numerically fitting the SdH data, using the inherent separation of the fast and slow oscillations. We compare systems with only Rashba SOI and both Rashba and Dresselhaus SOI with and without an in-plane magnetic field. The energy spectra are characterized in terms of symmetries, which have direct and visible consequences in the magneto-oscillations. To highlight the benefits of our methodology, we use it to extract the spin-orbit parameters by fitting realistic transport data. (AU)

• FAPESP's process: 20/00841-9 - Shubnikov-de-Haas oscillations in topological and non-topological electron systems
• Grantee: José Carlos Egues de Menezes
• Support Opportunities: Regular Research Grants
• FAPESP's process: 16/08468-0 - Topological insulators and Majorana fermions
• Grantee: José Carlos Egues de Menezes
• Support Opportunities: Regular Research Grants