Charge Writing at the LaAlO3/SrTiO3 surface.
Biased conducting-tip atomic force microscopy (AFM) has been shown to write and erase nanoscale metallic lines at the LaAlO(3)/SrTiO(3) interface. Using various AFM modes, we show the mechanism of conductivity switching is the writing of surface charge. These charges are stably deposited on a wide range of LaAlO(3) thicknesses, including bulk crystals. A strong asymmetry with writing polarity was found for 1 and 2 unit cells of LaAlO(3), providing experimental evidence for a theoretically predicted built-in potential.
Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba, Japan.
Yanwu
Y
Xie
Christopher
C
Bell
Takeaki
T
Yajima
Yasuyuki
Y
Hikita
Harold Y
HY
Hwang