Scanning tunneling microscopy of RF oscillating surfaces
作者:
E. Chilla,
W. Rohrbeck,
H.‐J. Fröhlich,
R. Koch,
K. H. Rieder,
期刊:
Annalen der Physik
(WILEY Available online 1994)
卷期:
Volume 506,
issue 1
页码: 21-27
ISSN:0003-3804
年代: 1994
DOI:10.1002/andp.19945060104
出版商: WILEY‐VCH Verlag
关键词: Scanning tunneling microscopy;Surface acoustic waves
数据来源: WILEY
摘要:
AbstractAmplitude and phase of high frequency surface acoustic wave (SAW) fields are investigated by a novel scanning tunneling microscopy technique. The gap voltage is modulated at a slightly detuned high frequency. Due to the nonlinearity of the tunneling process a frequency mixing appears. For scanned areas with dimensions much smaller than the wavelength of the SAW a remarkable local variation of amplitude and phase of the tunneling current at the difference frequency is observed. Depending on the local morphology different components of the particle displacement vector are detected. Model calculations of amplitude and phase images are presented for a real topography.
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