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arXiv · 1707.01171

Long-range non-Coulombic electron-electron interactions between coupled LaAlO$_3$/SrTiO$_3$ nanowires

Yuhe Tang·Anthony Tylan-Tyler·Hyungwoo Lee·Michelle Tomczyk·Mengchen Huang·Chang-Beom Eom·Patrick Irvin·Jeremy Levy
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Abstract

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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Yuhe Tang, Anthony Tylan-Tyler, Hyungwoo Lee, Michelle Tomczyk, Mengchen Huang, Chang-Beom Eom, Patrick Irvin, Jeremy Levy. 2017-07-04. Long-range non-Coulombic electron-electron interactions between coupled LaAlO$_3$/SrTiO$_3$ nanowires. https://arxiv.org/abs/1707.01171

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