Quasi-two-dimensional electron gas at the oxide interfaces for topological quantum physics
Artikel i vetenskaplig tidskrift, 2021

The development of “fault-tolerant” quantum computers, unaffected by noise and decoherence, is one of the fundamental challenges in quantum technology. One of the approaches currently followed is the realization of “topologically protected” qubits which make use of quantum systems characterized by a degenerate ground state of composite particles, known as “non-Abelian anyons”, able to encode and manipulate quantum information in a non-local manner. In this paper, we discuss the potential of quasi-two-dimensional electron gas (q2DEG) at the interface between band insulating oxides, like LaAlO3 and SrTiO3, as an innovative technological platform for the realization of topological quantum systems. Being characterized by a unique combination of unconventional spin-orbit coupling, magnetism, and 2D-superconductivity, these systems naturally possess most of the fundamental characteristics needed for the realization of a topological superconductor. These properties can be widely tuned by electric field effect acting on the orbital splitting and occupation of the non-degenerate 3dxy and 3dxz,yz bands. The topological state in oxide q2DEGs quasi-one-dimensional nanochannels could be therefore suitably controlled, leading to conceptual new methods for the realization of a topological quantum electronics based on the tuning of the orbital degrees of freedom.


A. Barthelemy

Université Paris-Saclay

N. Bergeal

Centre national de la recherche scientifique (CNRS)

M. Bibes

Université Paris-Saclay

Andrea D. Caviglia

TU Delft

R. Citro

Universita degli Studi di Salerno

SPIN CNR Institute - Salerno

M. Cuoco

SPIN CNR Institute - Salerno

Alexei Kalaboukhov

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

B. Kalisky

Bar-Ilan University

A. Perroni

Universita degli Studi di Napoli Federico II

J. Santamaria

Universidad Complutense de Madrid

D. Stornaiuolo

CNR - SuPerconducting and other INnovative materials and devices institute, Napoli

Bar-Ilan University

Marco Salluzzo

CNR - SuPerconducting and other INnovative materials and devices institute, Napoli

Europhysics Letters

0295-5075 (ISSN) 1286-4854 (eISSN)

Vol. 133 1 17001


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