Scanning tunneling spectroscopy on cleaved semiconductor heterostructure surfaces	Quantized subbands in a quantum well	Electron wave interference at a potential barrier

 　　

Density-of-states Imaging in Semiconductor Heterostructures

　

We have succeeded in the spatial imaging of the density-of-states (corresponding to the squared wavefunctions) in semiconductor heterostructures by scanning tunneling spectroscopy on cleaved surfaces. Quantized subbands in a quantum well, electron wave interference at a potential barrier, and wavefunction coupling in a double quantum well have been clearly observed. This method makes it possible to analyze wavefunction distributions in optical and electronic heterostructure devices. (Page 33)

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