Long‐Range Non‐Coulombic Electron–Electron Interactions between LaAlO 3 /SrTiO 3 Nanowires

Tang, Yuhe; Tylan‐Tyler, Anthony; Lee, Hyungwoo; Lee, Jung‐Woo; Tomczyk, Michelle; Huang, Mengchen; Eom, Chang‐Beom; Irvin, Patrick; Levy, Jeremy

doi:10.1002/admi.201900301

Title: Long‐Range Non‐Coulombic Electron–Electron Interactions between LaAlO ₃ /SrTiO ₃ Nanowires

Journal Article · Mon Apr 08 00:00:00 EDT 2019 · Advanced Materials Interfaces

DOI:https://doi.org/10.1002/admi.201900301· OSTI ID:1505656

Tang, Yuhe ^[1]; Tylan‐Tyler, Anthony ^[1]; Lee, Hyungwoo ^[2]; Lee, Jung‐Woo ^[2]; Tomczyk, Michelle ^[1]; Huang, Mengchen ^[1]; Eom, Chang‐Beom ^[2]; Irvin, Patrick ^[1];

^[1]

Department of Physics and Astronomy University of Pittsburgh Pittsburgh PA 15260 USA, Pittsburgh Quantum Institute Pittsburgh PA 15260 USA
Department of Materials Science and Engineering University of Wisconsin‐Madison Madison WI 53706 USA

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 evidence for long‐range electron–electron interactions in LaAlO ₃ /SrTiO ₃ nanowires, measured through the phenomenon of frictional drag, is reported, 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 demonstrate long‐range frictional coupling even in the presence of an electrically grounded central wire. Collectively, these results provide evidence for a new long‐range non‐Coulombic electron–electron interaction unlike anything previously reported for semiconducting systems.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐SC0014417; DE‐FG02‐06ER46327

OSTI ID:: 1505656

Journal Information:: Advanced Materials Interfaces, Journal Name: Advanced Materials Interfaces Vol. 6 Journal Issue: 15; ISSN 2196-7350

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Cited by: 4 works

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