Frictional drag between superconducting LaAlO$_3$/SrTiO$_3$ nanowires
We report frictional drag measurements between two superconducting LaAlO$_3$/SrTiO$_3$ nanowires. In these experiments, current passing through one nanowire induces a voltage across a nearby electrically isolated nanowire. The frictional drag signal contains both symmetric and antisymmetric componen...
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Main Authors | , , , , , , , , |
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Format | Journal Article |
Language | English |
Published |
15.12.2019
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Subjects | |
Online Access | Get full text |
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Summary: | We report frictional drag measurements between two superconducting
LaAlO$_3$/SrTiO$_3$ nanowires. In these experiments, current passing through
one nanowire induces a voltage across a nearby electrically isolated nanowire.
The frictional drag signal contains both symmetric and antisymmetric
components. The antisymmetric component arises from the rectification of
quantum shot noise in the drive nanowire by the broken symmetry in the drag
nanowire. The symmetric component in the drag resistance is ascribed to
rectification of thermal noise in the drive nanowire during
superconducting-normal transition. The suppression of the symmetric component
is observed when a normal nanowire is used as either a drag or drive nanowire
with the other nanowire superconducting. The absence of symmetric drag
resistance between a normal drag nanowire and a superconducting drive nanowire
suggests a higher electron-hole asymmetry in the superconducting
LaAlO$_3$/SrTiO$_3$ nanowire arising from the 1D nature of superconductivity at
LaAlO$_3$/SrTiO$_3$ interface. |
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DOI: | 10.48550/arxiv.1912.07078 |