Random magnetic field and weak localization effects in a dimpled 2D electron gas

✍ Scribed by G.M. Gusev; U. Gennser; X. Kleber; D.K. Maude; J.C. Portal; D.I. Lubyshev; P. Basmaji; M.de P.A. Silva; J.C. Rossi; Yu V. Nastaushev

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 219 KB
• Volume: 18
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.1995.1089

✦ Synopsis

We have studied negative magnetoresistance due to the weak localization effects in a 2D electron gas (2DEG) grown on dimpled substrates. Since the 2DEG is sensitive only to the normal component of (\mathrm{B}), depending on the orientation of the external magnetic field, electrons will move in a spatially inhomogeneous ( (B) perpendicular to the substrate- (B_{1}) ) or sign alternating, random magnetic field ( (B) parallel to the substrate (B_{11}) ). A difference in the magnetoresistance at (\mathrm{B}{11}) and (\mathrm{B}{1}) is seen for the sample with a coherence length larger than the spatial periodicity of magnetic field. We believe that the difference in the magnetic flux through the closed electron trajectories at (\mathrm{B}{\mathrm{H}}) and (\mathrm{B}{1}), taken into account random character of (B_{I I}), is responsible for this behaviour. Features connected with Aharonov Bohm flux through the different areas on the dimpled surface were observed.