Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session B61: Superconductivity: Proximity & Andreev
11:30 AM–2:18 PM,
Monday, March 14, 2022
Room: Hyatt Regency Hotel -Field
Sponsoring
Unit:
DCMP
Chair: Sanu Mishra, Los alamos National Lab
Abstract: B61.00012 : Enhancement of the Chiral Andreev Edge State Interference Signals*
1:42 PM–1:54 PM
Presenter:
Jordan McCourt
(Duke University)
Author:
Jordan McCourt
(Duke University)
interface of a quantum Hall (QH) edge and a superconductor, as reported earlier by our
group. The modes consist of electron and hole states hybridized by the superconductor,
which propagate along the contact interface in the direction determined by the magnetic
field. Specifically, we observe CAES interference in the form of voltage fluctuations
downstream from the grounded superconducting contact. Our previous measurements of the
downstream voltage fluctuations have produced small signals which inhibit the prospect of
coherently manipulating the CAES. Further studies have produced larger signals, however
the fabrication parameters responsible are poorly understood. Here we discuss attempts to
increase the prominence of the interference effects through studies of the
superconductor-graphene interface. Devices of different materials and various interface
lengths are considered to better understand the parameters determining the signal strength.
We also present fabrication techniques that are expected to improve device performance.
*Authors acknowledge support from the Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, US Department of Energy, under award no. DE-SC0002765, NSF awards ECCS-1610213, DMR-1743907, ARO award W911NF-16-1-0122, Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, US Department of Energy, under award no. DE-SC0005237, ARO (award W911NF-16-1-0132), JSPS KAKENHI grant no. JP15K21722 , JSPS Grant-in-Aid for Scientific Research A (no. 26248061) and JSPS Innovative Areas Nano Informatics (no. 25106006).
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