Influence of quantizing magnetic field and Rashba effect on indium arsenide metal-oxide-semiconductor structure accumulation capacitance

A. P. Kovchavtsev, M. S. Aksenov, A. V. Tsarenko, A. E. Nastovjak, A. G. Pogosov, D. A. Pokhabov, O. E. Tereshchenko, N. A. Valisheva

Research output: Contribution to journalArticlepeer-review

Abstract

The accumulation capacitance oscillations behavior in the n-InAs metal-oxide-semiconductor structures with different densities of the built-in charge (Dbc) and the interface traps (Dit) at temperature 4.2 K in the magnetic field (B) 2-10 T, directed perpendicular to the semiconductor-dielectric interface, is studied. A decrease in the oscillation frequency and an increase in the capacitance oscillation amplitude are observed with the increase in B. At the same time, for a certain surface accumulation band bending, the influence of the Rashba effect, which is expressed in the oscillations decay and breakdown, is traced. The experimental capacitance-voltage curves are in a good agreement with the numeric simulation results of the self-consistent solution of Schrödinger and Poisson equations in the magnetic field, taking into account the quantization, nonparabolicity of dispersion law, and Fermi-Dirac electron statistics, with the allowance for the Rashba effect. The Landau quantum level broadening in a two-dimensional electron gas (Lorentzian-shaped density of states), due to the electron scattering mechanism, linearly depends on the magnetic field. The correlation between the interface electronic properties and the characteristic scattering times was established.

Original languageEnglish
Article number173901
Number of pages6
JournalJournal of Applied Physics
Volume123
Issue number17
DOIs
Publication statusPublished - 7 May 2018

Keywords

  • SURFACE
  • PASSIVATION

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