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Title: Strong Aharonov-Bohm quantum interference in simply connected LaAlO3/SrTiO3 structures

Abstract

We report Aharonov-Bohm (AB) type quantum interference in simply connected devices created at the LaAlO3/SrTiO3 interface using conductive atomic force microscope (c-AFM) lithography. The oscillations are multiperiodic functions of magnetic field strength, and they exhibit a substantial magnetic hysteresis with frequencies that depend 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. In this work, the interference phenomena are associated with an inhomogeneous magnetic landscape within theLaAlO3/SrTiO3 nanostructures.

Authors:
 [1];  [2];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1]
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  1. Univ. of Pittsburgh, PA (United States)
  2. Univ. of Wisconsin, Madison, WI (United States)
Publication Date:
Research Org.:
Univ. of Pittsburgh, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); US Department of the Navy, Office of Naval Research (ONR); US Air Force Office of Scientific Research (AFOSR)
OSTI Identifier:
1802640
Alternate Identifier(s):
OSTI ID: 1569301
Grant/Contract Number:  
SC0014417; FA9550-15-1-0334
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 16; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Materials Science; Physics

Citation Formats

Irvin, Patrick, Lee, Hyungwoo, Lee, Jung-Woo, Briggeman, Megan, Lu, Shicheng, Annadi, Anil, Cheng, Guanglei, Tomczyk, Michelle, Li, Jinanan, Huang, Mengchen, Eom, Chang-Beom, and Levy, Jeremy. Strong Aharonov-Bohm quantum interference in simply connected LaAlO3/SrTiO3 structures. United States: N. p., 2019. Web. doi:10.1103/physrevb.100.161103.
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Irvin, Patrick, Lee, Hyungwoo, Lee, Jung-Woo, Briggeman, Megan, Lu, Shicheng, Annadi, Anil, Cheng, Guanglei, Tomczyk, Michelle, Li, Jinanan, Huang, Mengchen, Eom, Chang-Beom, & Levy, Jeremy. Strong Aharonov-Bohm quantum interference in simply connected LaAlO3/SrTiO3 structures. United States. https://doi.org/10.1103/physrevb.100.161103
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Irvin, Patrick, Lee, Hyungwoo, Lee, Jung-Woo, Briggeman, Megan, Lu, Shicheng, Annadi, Anil, Cheng, Guanglei, Tomczyk, Michelle, Li, Jinanan, Huang, Mengchen, Eom, Chang-Beom, and Levy, Jeremy. Fri . "Strong Aharonov-Bohm quantum interference in simply connected LaAlO3/SrTiO3 structures". United States. https://doi.org/10.1103/physrevb.100.161103. https://www.osti.gov/servlets/purl/1802640.
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@article{osti_1802640,
title = {Strong Aharonov-Bohm quantum interference in simply connected LaAlO3/SrTiO3 structures},
author = {Irvin, Patrick and Lee, Hyungwoo and Lee, Jung-Woo and Briggeman, Megan and Lu, Shicheng and Annadi, Anil and Cheng, Guanglei and Tomczyk, Michelle and Li, Jinanan and Huang, Mengchen and Eom, Chang-Beom and Levy, Jeremy},
abstractNote = {We report Aharonov-Bohm (AB) type quantum interference in simply connected devices created at the LaAlO3/SrTiO3 interface using conductive atomic force microscope (c-AFM) lithography. The oscillations are multiperiodic functions of magnetic field strength, and they exhibit a substantial magnetic hysteresis with frequencies that depend 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. In this work, the interference phenomena are associated with an inhomogeneous magnetic landscape within theLaAlO3/SrTiO3 nanostructures.},
doi = {10.1103/physrevb.100.161103},
journal = {Physical Review B},
number = 16,
volume = 100,
place = {United States},
year = {Fri Oct 04 00:00:00 EDT 2019},
month = {Fri Oct 04 00:00:00 EDT 2019}
}
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Journal Article:
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https://doi.org/10.1103/physrevb.100.161103
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