Scanning Tunneling Microscopy of Modulated Surface Structures

Scanning Tunneling Microscopy of Surface Structures

Surface science got a new impact with the development of the seanning tunneling microscope, since for the first time atomic-resolution observations of surface structures in real space have becomepossible. Following ashort description of the basic features of the seanning tunneling microscopy, some selected results are presented which illustrate the potential of the technique to provide informat...

Determination of buried dislocation structures by scanning tunneling microscopy

Using scanning tunneling microscopy on Cu/Ru~0001! thin films we have located the depth at which the cores of misfit dislocations lie below the film surface. The procedure is based on matching areas with unknown structure to areas with a known stacking sequence in the same film. Our results show that dislocations occur not only at the Cu/Ru interface, but also at various levels within the Cu fi...

Cross-sectional scanning tunneling microscopy of GaAsSbÕGaAs quantum well structures

We have used cross-sectional scanning tunneling microscopy ~STM! to perform nanometer-scale characterization of compositional structure and interfacial properties within GaAs12xSbx /GaAs double-quantum well structures. An algorithm has been devised based on analysis of strain effects in STM data to obtain detailed, quantitative compositional profiles within alloy layers. Using this and other an...

Cross-sectional scanning tunneling microscopy of epitaxial GaAs structures

The scanning tunneling microscope is used to study GaAs epitaxial structures, cleaved in ultrahigh vacuum, and viewed in cross section. Two applications are described: in the first, the net donor concentration in Si-doped GaAs is deduced by direct measurement of the depletion width at pn junctions. In the vicinity of the pn junctions, net donor concentrations of greater than 2X 10 cm3 are obser...

Microscopy, Scanning Tunneling