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Title: Tunable one-dimensional electron gas carrier densities at nanostructured oxide interfaces

Abstract

The emergence of two-dimensional metallic states at the LaAlO3/SrTiO3 (LAO/STO) heterostructure interface is known to occur at a critical thickness of four LAO over layers. This insulator-to-metal transition can be explained through the polar catastrophe mechanism arising from the divergence of the electrostatic potential at the LAO surface. Here, we demonstrate that nanostructuring can be effective in reducing or eliminating this critical thickness. Employing a modified polar catastrophe" model, we demonstrate that the nanowire heterostructure electrostatic potential diverges more rapidly as a function of layer thickness than in a regular heterostructure. Our first principles calculations indicate that for nanowire heterostructure geometries a one-dimensional electron gas (1DEG) can be induced, consistent with recent experimental observations of 1D conductivity in LAO/STO steps. Similar to LAO/STO 2DEGs, we predict that the 1D charge density will decay laterally within a few unit cells away from the nanowire; thus providing a mechanism for tuning the carrier behavior between 1D and 2D conductivity. Furthermore, our work provides insight into the creation and manipulation of charge density at an oxide heterostructure interface and therefore may be beneficial for future nanoelectronic devices and for the engineering of novel quantum phases.

Authors:
 [1];  [1];  [2];  [2];  [2];  [2]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1255663
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; electronic properties and materials; electronic structure

Citation Formats

Zhang, Lipeng, Xu, Haixuan, Kent, Paul R. C., Ganesh, Panchapakesan, Cooper, Valentino R., and Zhuang, Houlong L. Tunable one-dimensional electron gas carrier densities at nanostructured oxide interfaces. United States: N. p., 2016. Web. doi:10.1038/srep25452.
Zhang, Lipeng, Xu, Haixuan, Kent, Paul R. C., Ganesh, Panchapakesan, Cooper, Valentino R., & Zhuang, Houlong L. Tunable one-dimensional electron gas carrier densities at nanostructured oxide interfaces. United States. doi:10.1038/srep25452.
Zhang, Lipeng, Xu, Haixuan, Kent, Paul R. C., Ganesh, Panchapakesan, Cooper, Valentino R., and Zhuang, Houlong L. Fri . "Tunable one-dimensional electron gas carrier densities at nanostructured oxide interfaces". United States. doi:10.1038/srep25452. https://www.osti.gov/servlets/purl/1255663.
@article{osti_1255663,
title = {Tunable one-dimensional electron gas carrier densities at nanostructured oxide interfaces},
author = {Zhang, Lipeng and Xu, Haixuan and Kent, Paul R. C. and Ganesh, Panchapakesan and Cooper, Valentino R. and Zhuang, Houlong L.},
abstractNote = {The emergence of two-dimensional metallic states at the LaAlO3/SrTiO3 (LAO/STO) heterostructure interface is known to occur at a critical thickness of four LAO over layers. This insulator-to-metal transition can be explained through the polar catastrophe mechanism arising from the divergence of the electrostatic potential at the LAO surface. Here, we demonstrate that nanostructuring can be effective in reducing or eliminating this critical thickness. Employing a modified polar catastrophe" model, we demonstrate that the nanowire heterostructure electrostatic potential diverges more rapidly as a function of layer thickness than in a regular heterostructure. Our first principles calculations indicate that for nanowire heterostructure geometries a one-dimensional electron gas (1DEG) can be induced, consistent with recent experimental observations of 1D conductivity in LAO/STO steps. Similar to LAO/STO 2DEGs, we predict that the 1D charge density will decay laterally within a few unit cells away from the nanowire; thus providing a mechanism for tuning the carrier behavior between 1D and 2D conductivity. Furthermore, our work provides insight into the creation and manipulation of charge density at an oxide heterostructure interface and therefore may be beneficial for future nanoelectronic devices and for the engineering of novel quantum phases.},
doi = {10.1038/srep25452},
journal = {Scientific Reports},
number = ,
volume = 6,
place = {United States},
year = {2016},
month = {5}
}

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    Works referencing / citing this record:

    Tunable 2D electron gas at the LaAlO 3 / SrTiO 3 ( 001 ) interface
    journal, July 2019


    Tunable 2D electron gas at the LaAlO 3 / SrTiO 3 ( 001 ) interface
    journal, July 2019