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Magnetotransport of a two-dimensional electron gas with anisotropic Rashba interaction at the LaAlO3/SrTiO3 interface

Faridi, A ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevB.98.155442
  3. Publisher: American Physical Society , 2018
  4. Abstract:
  5. We investigate the magnetotransport properties of a two-dimensional electron gas with anisotropic k-cubic Rashba interaction at the LaAlO3/SrTiO3 interface. The Landau levels and density of states of the system as well as the magnetotransport coefficients are evaluated. A somehow anomalous beating pattern in low magnetic field regime is found in both the density profile and magnetoresistivity. We discuss the impact of electron density, Landau level broadening, and Rashba spin-orbit constant on the appearance of the beatings in low magnetic fields and find that at low electron concentrations and not very strong spin-orbit interactions the beatings smooth out. On the other hand, as the magnetic field increases, the Zeeman term becomes the dominant splitting mechanism, leading to the spin-split peaks in Shubnikov-de Haas oscillations. We also show that the observation of the beatings in low magnetic fields needs a system with rather higher carrier concentration so that the beatings persist up to sufficiently large fields where the oscillations are not smoothed out by Landau level broadening. The quantum Hall plateaus are evaluated, and we show the Chern number with both even and odd values is replaced by the odd numbers when two subband energies are close to spin-degenerate energy levels. Along with the numerical evaluation of the magnetotransport properties, a perturbative calculation is performed which can be used in the case of low densities and not very large filling factors. © 2018 American Physical Society
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  8. Source: Physical Review B ; Volume 98, Issue 15 , 2018 ; 24699950 (ISSN)
  9. URL: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.98.155442