Tailoring LaAlO3/SrTiO3 Interface Metallicity by Oxygen Surface Adsorbates

Weitao Dai; Sanjay Adhikari; Andrés Camilo Garcia-Castro; Aldo H. Romero; Hyungwoo Lee; Jung Woo Lee; Sangwoo Ryu; Chang Beom Eom; Cheng Cen

doi:10.1021/acs.nanolett.6b00421

Tailoring LaAlO₃/SrTiO₃ Interface Metallicity by Oxygen Surface Adsorbates

Weitao Dai
, Sanjay Adhikari
, Andrés Camilo Garcia-Castro
, Aldo H. Romero
, Hyungwoo Lee
, Jung Woo Lee
, Sangwoo Ryu
, Chang Beom Eom
, Cheng Cen

Dept. of Materials Science & Engineering

West Virginia University
University of Liege
Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional
University of Wisconsin-Madison

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

We report an oxygen surface adsorbates induced metal-insulator transition at the LaAlO₃/SrTiO₃ interfaces. The observed effects were attributed to the terminations of surface Al sites and the resultant electron-accepting surface states. By controlling the local oxygen adsorptions, we successfully demonstrated the nondestructive patterning of the interface two-dimensional electron gas (2DEG). The obtained 2DEG structures are stable in air and also robust against general solvent treatments. This study provides new insights into the metal-insulator transition mechanism at the complex oxide interfaces and also a highly efficient technique for tailoring the interface properties.

Original language	English
Pages (from-to)	2739-2743
Number of pages	5
Journal	Nano Letters
Volume	16
Issue number	4
DOIs	https://doi.org/10.1021/acs.nanolett.6b00421
State	Published - 13 Apr 2016

Keywords

2DEG
adsorbates
charge transfer doping
oxide interfaces
surface states

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10.1021/acs.nanolett.6b00421

Cite this

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title = "Tailoring LaAlO3/SrTiO3 Interface Metallicity by Oxygen Surface Adsorbates",

abstract = "We report an oxygen surface adsorbates induced metal-insulator transition at the LaAlO3/SrTiO3 interfaces. The observed effects were attributed to the terminations of surface Al sites and the resultant electron-accepting surface states. By controlling the local oxygen adsorptions, we successfully demonstrated the nondestructive patterning of the interface two-dimensional electron gas (2DEG). The obtained 2DEG structures are stable in air and also robust against general solvent treatments. This study provides new insights into the metal-insulator transition mechanism at the complex oxide interfaces and also a highly efficient technique for tailoring the interface properties.",

keywords = "2DEG, adsorbates, charge transfer doping, oxide interfaces, surface states",

author = "Weitao Dai and Sanjay Adhikari and Garcia-Castro, \{Andr{\'e}s Camilo\} and Romero, \{Aldo H.\} and Hyungwoo Lee and Lee, \{Jung Woo\} and Sangwoo Ryu and Eom, \{Chang Beom\} and Cheng Cen",

note = "Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

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doi = "10.1021/acs.nanolett.6b00421",

language = "English",

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TY - JOUR

T1 - Tailoring LaAlO3/SrTiO3 Interface Metallicity by Oxygen Surface Adsorbates

AU - Dai, Weitao

AU - Adhikari, Sanjay

AU - Garcia-Castro, Andrés Camilo

AU - Romero, Aldo H.

AU - Lee, Hyungwoo

AU - Lee, Jung Woo

AU - Ryu, Sangwoo

AU - Eom, Chang Beom

AU - Cen, Cheng

PY - 2016/4/13

Y1 - 2016/4/13

N2 - We report an oxygen surface adsorbates induced metal-insulator transition at the LaAlO3/SrTiO3 interfaces. The observed effects were attributed to the terminations of surface Al sites and the resultant electron-accepting surface states. By controlling the local oxygen adsorptions, we successfully demonstrated the nondestructive patterning of the interface two-dimensional electron gas (2DEG). The obtained 2DEG structures are stable in air and also robust against general solvent treatments. This study provides new insights into the metal-insulator transition mechanism at the complex oxide interfaces and also a highly efficient technique for tailoring the interface properties.

AB - We report an oxygen surface adsorbates induced metal-insulator transition at the LaAlO3/SrTiO3 interfaces. The observed effects were attributed to the terminations of surface Al sites and the resultant electron-accepting surface states. By controlling the local oxygen adsorptions, we successfully demonstrated the nondestructive patterning of the interface two-dimensional electron gas (2DEG). The obtained 2DEG structures are stable in air and also robust against general solvent treatments. This study provides new insights into the metal-insulator transition mechanism at the complex oxide interfaces and also a highly efficient technique for tailoring the interface properties.

KW - 2DEG

KW - adsorbates

KW - charge transfer doping

KW - oxide interfaces

KW - surface states

UR - https://www.scopus.com/pages/publications/84964802087

U2 - 10.1021/acs.nanolett.6b00421

DO - 10.1021/acs.nanolett.6b00421

M3 - Article

AN - SCOPUS:84964802087

SN - 1530-6984

VL - 16

SP - 2739

EP - 2743

JO - Nano Letters

JF - Nano Letters

IS - 4

ER -

Tailoring LaAlO₃/SrTiO₃ Interface Metallicity by Oxygen Surface Adsorbates

Abstract

Keywords

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