Shubnikov--de Haas--like Quantum Oscillations in Artificial One-Dimensional ${\mathrm{LaAlO}}_{3}/{\mathrm{SrTiO}}_{3}$ Electron Channels

Shubnikov–de Haas–like Quantum Oscillations in Artificial One-Dimensional ${LaAlO}_{3} / {SrTiO}_{3}$ Electron Channels

Guanglei Cheng, Anil Annadi, Shicheng Lu, Hyungwoo Lee, Jung-Woo Lee, Mengchen Huang, Chang-Beom Eom, Patrick Irvin, and Jeremy Levy

Phys. Rev. Lett. 120, 076801 – Published 14 February 2018

Abstract

The widely reported magnetoresistance oscillations in ${LaAlO}_{3} / {SrTiO}_{3}$ heterostructures have invariably been attributed to the Shubnikov–de Haas (SdH) effect, despite a pronounced inconsistency with low-field Hall resistance measurements. Here we report SdH-like resistance oscillations in quasi-1D electron waveguides created at the ${LaAlO}_{3} / {SrTiO}_{3}$ interface by conductive atomic force microscopy lithography. These oscillations can be directly attributed to magnetic depopulation of magnetoelectric subbands. Our results suggest that the SdH oscillations in 2D ${SrTiO}_{3}$ -based systems may originate from naturally forming quasi-1D channels.

Received 28 August 2017
Revised 26 October 2017

DOI:https://doi.org/10.1103/PhysRevLett.120.076801

Physics Subject Headings (PhySH)

Ballistic transport Shubnikov-de Haas effect

1-dimensional systems Nanowires Two-dimensional electron gas

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Guanglei Cheng^1,2,3,5, Anil Annadi^2,3, Shicheng Lu^2,3, Hyungwoo Lee⁴, Jung-Woo Lee⁴, Mengchen Huang^2,3, Chang-Beom Eom⁴, Patrick Irvin^2,3, and Jeremy Levy^2,3,*

¹CAS Key Laboratory of Microscale Magnetic Resonance and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
²Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
³Pittsburgh Quantum Institute, Pittsburgh, Pennsylvania 15260, USA
⁴Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
⁵Hefei National Laboratory for Physical Sciences, Hefei 230026, China