Comparing the local density of states of three- and two-dimensional electron systems by low-temperature scanning tunneling spectroscopy
✍ Scribed by M Morgenstern; D Haude; J Klijn; Chr Meyer; L Sacharow; S Heinze; S Blügel; R Wiesendanger
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 835 KB
- Volume
- 16
- Category
- Article
- ISSN
- 1386-9477
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✦ Synopsis
Scanning tunneling spectroscopy performed at T = 6 K is used to investigate the local density of states (LDOS) of electron systems in the bulk conduction band of InAs. In particular, the 3DES of the n-doped material and an adsorbate-induced 2DES located at the surface are investigated at B = 0 and 6 T. It is found that the 3DES at B = 0 T can be described by Bloch states weakly interacting with the potential disorder. The 2DES at B = 0 T exhibits much stronger LDOS corrugations revealing the tendency of weak localization. In a magnetic ÿeld both systems show drift states, which are expected in 2D, but are surprising in 3D, where they point to a new electron phase consisting of droplets of quasi 2D-systems.
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