Spin-polarized magneto-electronic properties in buckled monolayer GaAs
Open Access
- 20 February 2019
- journal article
- research article
- Published by Springer Science and Business Media LLC in Scientific Reports
- Vol. 9 (1), 1-12
- https://doi.org/10.1038/s41598-018-36516-8
Abstract
We develop the generalized tight-binding model to fully explore the magneto-electronic properties of monolayer GaAs, where the buckled structure, multi-orbital chemical bondings, spin-orbit coupling, electric field, and magnetic field are considered simultaneously. The diverse magnetic quantization covers three groups of spin-polarized Landau levels (LLs) near the Fermi level, with the unique initial energies, LL degeneracy, energy spacings, magnetic-field-dependence, and spin splitting. Furthermore, the Landau state probabilities exhibit specific oscillation patterns, being composed of the localization centers, node regularities, and energy-dependent variations of the dominating orbitals. The density of states directly reflects the main features of the LL energy spectra in the form, height, number, and frequency of the spin-split delta-function-like prominent peaks. The electric field leads to the monotonous/nonmonotonous LL energy dispersions, LL crossing behavior, gap modulation, phase transition and enhancement of spin splitting. The complex gap modulations and even semiconductor-semimetal transitions are attributed to the strong competition among the intrinsic interactions, magnetic field, and electric field. Such predicted magneto-electronic properties could be verified by scanning tunneling spectroscopy and are helpful in designing the top-gated and phase-change electronic devices.Funding Information
- Ministry of Science and Technology, Taiwan (105-2112-M-017-002-MY2, 105-2112-M-017-002-MY2, 102-2112-M-006-007-MY3)
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