Linear and nonlinear transport properties through a quantum point contact based on oxides two-dimensional electron gas is examined using the tight-binding method and the k . p approach. The ballistic transport is analyzed in contacts realized at the (001) interface between band insulators LaAlO3 and SrTiO3 by using the Landauer-Buttiker method for many sub-bands derived from three Ti 3d orbitals (d(yz), d(zx), and d(xy) ) in the presence of an out-of-plane magnetic field. We focus especially on the role played by the atomic spin-orbit coupling and the inversion-symmetry-breaking term. Three different transport regimes stem out: The first, at low energies, involving the first d(xy)-like sub-bands, where the conductance quantization is clearly observed; a second one, at intermediate energies, entailing further d(xy)-like sub-bands, where the sub-band splitting induced by the magnetic field is quenched; the third one, where the mixing between light d(xy)-like, heavy d(yz)-like, and d(zx)-like sub-bands is so strong that the conductance plateaus turn out to be very narrow. Very good agreement is found with recent experiments exploring the transport properties at low energies.

Ballistic transport through quantum point contacts of multiorbital oxides

Citro, R.
Supervision
;
Romeo, F.;Cataudella, V.;
2021

Abstract

Linear and nonlinear transport properties through a quantum point contact based on oxides two-dimensional electron gas is examined using the tight-binding method and the k . p approach. The ballistic transport is analyzed in contacts realized at the (001) interface between band insulators LaAlO3 and SrTiO3 by using the Landauer-Buttiker method for many sub-bands derived from three Ti 3d orbitals (d(yz), d(zx), and d(xy) ) in the presence of an out-of-plane magnetic field. We focus especially on the role played by the atomic spin-orbit coupling and the inversion-symmetry-breaking term. Three different transport regimes stem out: The first, at low energies, involving the first d(xy)-like sub-bands, where the conductance quantization is clearly observed; a second one, at intermediate energies, entailing further d(xy)-like sub-bands, where the sub-band splitting induced by the magnetic field is quenched; the third one, where the mixing between light d(xy)-like, heavy d(yz)-like, and d(zx)-like sub-bands is so strong that the conductance plateaus turn out to be very narrow. Very good agreement is found with recent experiments exploring the transport properties at low energies.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4766978
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