Non-universal current flow near the metal-insulator transition in an oxide interface

Eylon Persky, Naor Vardi, Ana Mafalda R. V. L. Monteiro, Thierry C. Thiel, Hyeok Yoon, Yanwu Xie, Benoît Fauqué, Andrea D. Caviglia, Harold Y. Hwang, Kamran Behnia, Jonathan Ruhman and Beena Kalisky ()
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Eylon Persky: Department of Physics and Institute of Nanotechnology and Advanced Materials, Bar-Ilan University
Naor Vardi: Department of Physics and Institute of Nanotechnology and Advanced Materials, Bar-Ilan University
Ana Mafalda R. V. L. Monteiro: Kavli Institute of Nanoscience, Delft University of Technology
Thierry C. Thiel: Kavli Institute of Nanoscience, Delft University of Technology
Hyeok Yoon: Stanford University
Yanwu Xie: Stanford University
Benoît Fauqué: PSL Research University
Andrea D. Caviglia: Kavli Institute of Nanoscience, Delft University of Technology
Harold Y. Hwang: Stanford University
Kamran Behnia: PSL Research University
Jonathan Ruhman: Department of Physics and Institute of Nanotechnology and Advanced Materials, Bar-Ilan University
Beena Kalisky: Department of Physics and Institute of Nanotechnology and Advanced Materials, Bar-Ilan University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract In systems near phase transitions, macroscopic properties often follow algebraic scaling laws, determined by the dimensionality and the underlying symmetries of the system. The emergence of such universal scaling implies that microscopic details are irrelevant. Here, we locally investigate the scaling properties of the metal-insulator transition at the LaAlO3/SrTiO3 interface. We show that, by changing the dimensionality and the symmetries of the electronic system, coupling between structural and electronic properties prevents the universal behavior near the transition. By imaging the current flow in the system, we reveal that structural domain boundaries modify the filamentary flow close to the transition point, preventing a fractal with the expected universal dimension from forming.

Date: 2021
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DOI: 10.1038/s41467-021-23393-5

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