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Tuning the Electron Gas at an Oxide Heterointerface via Free Surface Charges
Author(s) -
Xie Yanwu,
Bell Christopher,
Hikita Yasuyuki,
Hwang Harold Y.
Publication year - 2011
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201004673
Subject(s) - materials science , heterojunction , conductance , modulation (music) , polarity (international relations) , oxide , free electron model , optoelectronics , condensed matter physics , fermi gas , atomic force microscopy , surface (topology) , nanotechnology , chemical physics , electron , chemistry , physics , quantum mechanics , metallurgy , philosophy , biochemistry , cell , aesthetics , geometry , mathematics
Stable and polarity‐switchable free charges are written on the surface of a LaAlO 3 /SrTiO 3 heterostructure using conducting atomic force microscopy. These charges reversibly tune the conductance at the LaAlO 3 /SrTiO 3 interface in a non‐volatile way. The modulation in carrier density is large, ≈3 × 10 13 cm −2 , comparable to the maximum modulation achieved by the normal field effect.