Landolt-Börnstein - Group III Condensed Matter

8.3 Sample geometry


This chapter provides literature on sample geometry. The influence of the width and length of a wire onto its transport properties is discussed. The width dependence of the magnetoresistance (MR) is illustrated. The conductance normalized by the number of wires and the channel length was examined. In wide wires, conductance decreased nearly linearly with width, while it decreased more rapidly in narrower wires. MR measurements of wires with different widths at 1.5 K showed four contributions: (1) a negative MR due to weak localization at very small B, (2) SdH oscillations at large B, (3) AF in the whole field range, and (4) a slowly decreasing monotonic negative MR which was enhanced as w became smaller. The amplitude of the SdH oscillations was suppressed as the channel width decreased. The special geometry discussed in this chapter is a grid-like structure due to perpendicularly intersecting wire arrays. The two-terminal MR showed small periodic oscillations which were attributed to the Aharonov-Bohm effect.

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8.3 Sample geometry
Book Title
Electronic Transport. Part 1: Quantum Point Contacts and Quantum Wires
8 Lateral superlattices
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Landolt-Börnstein - Group III Condensed Matter
  • B. Kramer
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  • A. Fechner
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