Side Gate Tunable Josephson Junctions at the LaAlO/SrTiO Interface

Overview

Journal Nano Lett

Publisher American Chemical Society

Specialty Biotechnology

Date 2017 Jan 11

PMID 28071920

Citations 4

Authors

A M R V L Monteiro

D J Groenendijk

N Manca

E Mulazimoglu

S Goswami

Ya Blanter

L M K Vandersypen

A D Caviglia

Affiliations

Soon will be listed here.

Abstract

Novel physical phenomena arising at the interface of complex oxide heterostructures offer exciting opportunities for the development of future electronic devices. Using the prototypical LaAlO/SrTiO interface as a model system, we employ a single-step lithographic process to realize gate-tunable Josephson junctions through a combination of lateral confinement and local side gating. The action of the side gates is found to be comparable to that of a local back gate, constituting a robust and efficient way to control the properties of the interface at the nanoscale. We demonstrate that the side gates enable reliable tuning of both the normal-state resistance and the critical (Josephson) current of the constrictions. The conductance and Josephson current show mesoscopic fluctuations as a function of the applied side gate voltage, and the analysis of their amplitude enables the extraction of the phase coherence and thermal lengths. Finally, we realize a superconducting quantum interference device in which the critical currents of each of the constriction-type Josephson junctions can be controlled independently via the side gates.

Citing Articles

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Quantized critical supercurrent in SrTiO-based quantum point contacts.

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Nanopatterning of Weak Links in Superconducting Oxide Interfaces.

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PMID: 33557305 PMC: 7914727. DOI: 10.3390/nano11020398.

Transport regimes of a split gate superconducting quantum point contact in the two-dimensional LaAlO/SrTiO superfluid.

Thierschmann H, Mulazimoglu E, Manca N, Goswami S, Klapwijk T, Caviglia A Nat Commun. 2018; 9(1):2276.

PMID: 29892080 PMC: 5995834. DOI: 10.1038/s41467-018-04657-z.

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