Quasi-two-dimensional electron gas at the oxide interfaces for topological quantum physics
Journal article, 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.
Author
A. Barthelemy
University Paris-Saclay
N. Bergeal
Centre national de la recherche scientifique (CNRS)
M. Bibes
University Paris-Saclay
Andrea D. Caviglia
Delft University of Technology
R. Citro
University of Salerno
SPIN CNR Institute - Salerno
M. Cuoco
SPIN CNR Institute - Salerno
Alexei Kalaboukhov
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
B. Kalisky
Bar-Ilan University
A. Perroni
University of Naples Federico II
J. Santamaria
Complutense University
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 17001Subject Categories
Other Physics Topics
Other Electrical Engineering, Electronic Engineering, Information Engineering
Condensed Matter Physics
DOI
10.1209/0295-5075/133/17001