Comparing the local density of states of three- and two-dimensional electron systems by low-temperature scanning tunneling spectroscopy

Autor(en): Morgenstern, M
Haude, D
Klijn, J
Meyer, C 
Sacharow, L
Heinze, S 
Blugel, S
Wiesendanger, R
Stichwörter: ANTIFERROMAGNETISM; DOPANTS; GAS; METAL-INSULATOR-TRANSITION; Nanoscience & Nanotechnology; OSCILLATIONS; Physics; Physics, Condensed Matter; SCATTERING; Science & Technology - Other Topics; STEPS; SURFACE-STATE; WAVES
Erscheinungsdatum: 2003
Herausgeber: ELSEVIER
Journal: PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volumen: 16
Ausgabe: 1
Startseite: 121
Seitenende: 128
Zusammenfassung: 
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 field 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. (C) 2002 Elsevier Science B.V. All rights reserved.
Beschreibung: 
12th International Winterschool on New Developments in Solid State Physics, MAUTENDORF, AUSTRIA, FEB 25-MAR 01, 2002
ISSN: 13869477
DOI: 10.1016/S1386-9477(02)00585-4

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