Tuning the Electron Gas at an Oxide Heterointerface via Free Surface Charges

Stable and polarity‐switchable free charges are written on the surface of a LaAlO3/SrTiO3 heterostructure using conducting atomic force microscopy. These charges reversibly tune the conductance at the LaAlO3/SrTiO3 interface in a non‐volatile way. The modulation in carrier density is large, ≈3 × 101...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2011-04, Vol.23 (15), p.1744-1747
Main Authors: Xie, Yanwu, Bell, Christopher, Hikita, Yasuyuki, Hwang, Harold Y.
Format: Article
Language:English
Subjects:
atomic force microscopy (AFM)
complex oxides
Electrons
Gases - chemistry
heterointerfaces
Membranes, Artificial
Oxides - chemistry
Particle Size
surface charge
Surface Properties
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Summary:Stable and polarity‐switchable free charges are written on the surface of a LaAlO3/SrTiO3 heterostructure using conducting atomic force microscopy. These charges reversibly tune the conductance at the LaAlO3/SrTiO3 interface in a non‐volatile way. The modulation in carrier density is large, ≈3 × 1013 cm−2, comparable to the maximum modulation achieved by the normal field effect.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201004673