Long-range non-Coulombic electron-electron interactions between coupled LaAlO\(_3\)/SrTiO\(_3\) nanowires
The LaAlO\(_3\)/SrTiO\(_3\) system exhibits unusual magnetic and superconducting behavior arising from electron-electron interactions whose physical origin is not well understood. Quantum transport techniques, especially those involving mesoscopic geometries, can offer insight into these interaction...
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Published in | arXiv.org |
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Main Authors | , , , , , , , |
Format | Paper |
Language | English |
Published |
Ithaca
Cornell University Library, arXiv.org
30.12.2018
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Subjects | |
Online Access | Get full text |
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Summary: | The LaAlO\(_3\)/SrTiO\(_3\) system exhibits unusual magnetic and superconducting behavior arising from electron-electron interactions whose physical origin is not well understood. Quantum transport techniques, especially those involving mesoscopic geometries, can offer insight into these interactions. Here we report evidence for long-range electron-electron interactions in LaAlO\(_3\)/SrTiO\(_3\) nanowires, measured through the phenomenon of frictional drag, in which current passing through one nanowire induces a voltage across a nearby electrically isolated nanowire. Frictional drag mediated by the Coulomb interaction is predicted to decay exponentially with interwire separation, but with the LaAlO\(_3\)/SrTiO\(_3\) nanowire system it is found to be nearly independent of separation. Frictional drag experiments performed with three parallel wires demonstrates long-range frictional coupling even in the presence of an electrically grounded central wire. Collectively, these results provides evidence for a new long-range non-Coulombic electron-electron interaction unlike anything previously reported for semiconducting systems. |
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ISSN: | 2331-8422 |