Micrometer-Scale Ballistic Transport of Electron Pairs in LaAlO_{3}/SrTiO_{3} Nanowires.
High-mobility complex-oxide heterostructures and nanostructures offer new opportunities for extending the paradigm of quantum transport beyond the realm of traditional III-V or carbon-based materials. Recent quantum transport investigations with LaAlO_{3}/SrTiO_{3}-based quantum dots reveal the existence of a strongly correlated phase in which electrons form spin-singlet pairs without becoming superconducting. Here, we report evidence for the micrometer-scale ballistic transport of electron pairs in quasi-1D LaAlO_{3}/SrTiO_{3} nanowire cavities. In the paired phase, Fabry-Perot-like quantum interference is observed, in sync with conductance oscillations observed in the superconducting regime (at a zero magnetic field). Above a critical magnetic field B_{p}, the electron pairs unbind and the conductance oscillations shift with the magnetic field. These experimental observations extend the regime of ballistic electronic transport to strongly correlated phases.
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.|Pittsburgh Quantum Institute, Pittsburgh, Pennsylvania 15260, USA.
Michelle
M
Tomczyk
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.|Pittsburgh Quantum Institute, Pittsburgh, Pennsylvania 15260, USA.
Guanglei
G
Cheng
Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Hyungwoo
H
Lee
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.|Pittsburgh Quantum Institute, Pittsburgh, Pennsylvania 15260, USA.
Shicheng
S
Lu
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.|Pittsburgh Quantum Institute, Pittsburgh, Pennsylvania 15260, USA.
Anil
A
Annadi
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.
Joshua P
JP
Veazey
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.|Pittsburgh Quantum Institute, Pittsburgh, Pennsylvania 15260, USA.
Mengchen
M
Huang
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.|Pittsburgh Quantum Institute, Pittsburgh, Pennsylvania 15260, USA.
Patrick
P
Irvin
Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Sangwoo
S
Ryu
Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Chang-Beom
CB
Eom
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.|Pittsburgh Quantum Institute, Pittsburgh, Pennsylvania 15260, USA.
Jeremy
J
Levy