Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session T70: Poster Session III(1:00pm-4:00pm)
1:00 PM,
Thursday, March 7, 2019
BCEC
Room: Exhibit Hall
Abstract: T70.00177 : Device for extraction of Majorana current by means of Fraunhofer diffraction in proximitized superconducting arrays*
Presenter:
Xiangyu Song
(Physics, University of Illinois at Urbana-Champaign)
Authors:
Xiangyu Song
(Physics, University of Illinois at Urbana-Champaign)
Yang Bai
(Physics, University of Illinois at Urbana-Champaign)
James Eckstein
(Physics, University of Illinois at Urbana-Champaign)
Alexey Bezryadin
(Physics, University of Illinois at Urbana-Champaign)
We performed transport experiment on superconductor-topological insulator-superconductor Josephson junctions array consisting of square niobium islands on a Bi2Se3 film.
According to a Fraunhofer diffraction model, when perpendicular magnetic field is applied such that there is exactly one flux quantum in each junction we should achieve the desired regime where Majorana current is the only supercurrent in the sample. Our results indicate that the conductance peak corresponding to ordinary supercurrent indeed disappears at such magnetic flux bias. Yet, even at this flux bias (frustration f=2) the sample resistance approaches zero rapidly with cooling. This divergence of the conductance at the flux when the ordinary superconductivity is suppressed is taken as evidence for Majorana mode supercurrent.
Geometrical inhomogeneity has been modelled and, apparently, cannot account the observed zeroing of the resistance.
*NSF DMR 18-36710
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