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Long‐Range Non‐Coulombic Electron–Electron Interactions between LaAlO 3 /SrTiO 3 Nanowires
Author(s) -
Tang Yuhe,
TylanTyler Anthony,
Lee Hyungwoo,
Lee JungWoo,
Tomczyk Michelle,
Huang Mengchen,
Eom ChangBeom,
Irvin Patrick,
Levy Jeremy
Publication year - 2019
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201900301
Subject(s) - nanowire , mesoscopic physics , electron , condensed matter physics , drag , materials science , coulomb , range (aeronautics) , superconductivity , nanotechnology , physics , mechanics , quantum mechanics , composite material
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.