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

Yanwu Xie: Christopher Bell, Yasuyuki Hikita, Harold Y. Hwang; Advanced Materials, 04/19/11.

Additional Authors: Christopher Bell, Yasuyuki Hikita, Harold Y. Hwang

Abstract:

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.