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Remote Mesoscopic Signatures of Induced Magnetic Texture in Graphene
Author(s)
Arabchigavkani, N.
He, G.
Nathawat, J.
Yin, S.
Barut, B.
He, K.
Randle, M. D.
Dixit, R.
Sakanashi, K.
Aoki, N.
Zhang, K.
Wang, L.
Mei, W. N.
Dowben, P. A.
Fransson, J.
Bird, J. P.
Date Issued
February 25, 2021
Type
Article
Abstract
Mesoscopic conductance fluctuations are a ubiquitous signature of phase-coherent transport in small conductors, exhibiting universal character independent of system details. In this Letter, however, we demonstrate a pronounced breakdown of this universality, due to the interplay of local and remote phenomena in transport. Our experiments are performed in a graphene-based interaction-detection geometry, in which an artificial magnetic texture is induced in the graphene layer by covering a portion of it with a micromagnet. When probing conduction at some distance from this region, the strong influence of remote factors is manifested through the appearance of giant conductance fluctuations, with amplitude much larger than e2/h. This violation of one of the fundamental tenets of mesoscopic physics dramatically demonstrates how local considerations can be overwhelmed by remote signatures in phase-coherent conductors.
Citation
Physical Review Letters, 126(8), 2021