Remote Mesoscopic Signatures of Induced Magnetic Texture in Graphene

Authors

N. Arabchigavkani, University at Buffalo, The State University of New York
R. Somphonsane, King Mongkut's Institute of Technology Ladkrabang
H. Ramamoorthy, King Mongkut's Institute of Technology Ladkrabang
G. He, University at Buffalo, The State University of New York
J. Nathawat, University at Buffalo, The State University of New York
S. Yin, University at Buffalo, The State University of New York
B. Barut, University at Buffalo, The State University of New York
K. He, University at Buffalo, The State University of New York
M. D. Randle, University at Buffalo, The State University of New York
R. Dixit, University at Buffalo, The State University of New York
K. Sakanashi, Chiba University
N. Aoki, Chiba University
K. Zhang, University of Science and Technology of China
L. Wang, University of Science and Technology of China
W. N. Mei, University of Nebraska at OmahaFollow
Peter Dowben, University of Nebraska - LincolnFollow
J. Fransson, Uppsala Universitet
J. P. Bird, University at Buffalo, The State University of New York

ORCID IDs

N. Arabchigavkani https://orcid.org/0000-0003-1459-1051

R. Somphonsane https://orcid.org/0000-0002-8344-1228

H. Ramamoorthy https://orcid.org/0000-0002-4282-2948

G. He https://orcid.org/0000-0001-8700-2487

J. Nathawat https://orcid.org/0000-0001-8520-2741

N. Aoki https://orcid.org/0000-0001-9203-6040

P. A. Dowben https://orcid.org/0000-0002-2198-4710

J. Fransson https://orcid.org/0000-0002-9217-2218

J. P. Bird https://orcid.org/0000-0002-6966-9007

Date of this Version

2-25-2021

Citation

PHYSICAL REVIEW LETTERS 126, 086802 (2021)

DOI: 10.1103/PhysRevLett.126.086802

Comments

© 2021 American Physical Society. Used by permission.

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.