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arXiv · 1909.11259

Strong Aharonov-Bohm quantum interference in simply-connected LaAlO$_3$/SrTiO$_3$ structures

Patrick Irvin·Hyungwoo Lee·Jung-Woo Lee·Megan Briggeman·Shicheng Liu·Anil Annadi·Guanglei Cheng·Michelle Tomczyk·Jinanan Li·Mengchen Huang·Chang-Beom Eom·Jeremy Levy
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Abstract

We report Aharonov-Bohm (AB)-type quantum interference in simply-connected devices created at the LaAlO$_3$/SrTiO$_3$ interface using conductive-atomic force microscope (c-AFM) lithography. The oscillations are multi-periodic functions of magnetic field strength, and they exhibit a substantial magnetic hysteresis with frequencies that depends on the magnetic sweep direction. The oscillation amplitude for the lowest two frequencies approaches $e^2/h$, consistent with the theoretical maximum for the AB effect, and harmonics up to third order are observable. Broadband quasiperiodic behavior is reported in a fraction of simply-connected electron waveguide devices that exhibit magnetic asymmetries. Curiously, nanoscale ring devices that are multiply-connected lack signatures of AB quantum interference. The interference phenomena are associated with an inhomogeneous magnetic landscape within the LaAlO$_3$/SrTiO$_3$ nanostructures.

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Patrick Irvin, Hyungwoo Lee, Jung-Woo Lee, Megan Briggeman, Shicheng Liu, Anil Annadi, Guanglei Cheng, Michelle Tomczyk, Jinanan Li, Mengchen Huang, Chang-Beom Eom, Jeremy Levy. 2019-09-25. Strong Aharonov-Bohm quantum interference in simply-connected LaAlO$_3$/SrTiO$_3$ structures. https://doi.org/10.1103/physrevb.100.161103

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