Tailoring LaAlO3/SrTiO3 Interface Metallicity by Oxygen Surface Adsorbates

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 de...

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Bibliographic Details
Published in:Nano letters 2016-04, Vol.16 (4), p.2739-2743
Main Authors: Dai, Weitao, Adhikari, Sanjay, Garcia-Castro, Andrés Camilo, Romero, Aldo H, Lee, Hyungwoo, Lee, Jung-Woo, Ryu, Sangwoo, Eom, Chang-Beom, Cen, Cheng
Format: Article
Language:English
Subjects:
2DEG
adsorbates
charge transfer doping
oxide interfaces
surface states
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Summary: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.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.6b00421