Anomalous magnetoresistance peak in quantum wires: Evidence for boundary-scattering mechanisms

S. Block, M. Suhrke, S. Wilke, A. Menschig, H. Schweizer, and D. Grützmacher
Phys. Rev. B 47, 6524 – Published 15 March 1993
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Abstract

We present a combined experimental and theoretical investigation of the low-temperature magnetoresistance of quantum wires. A remarkable experimental feature is an anomalous resistance maximum at low magnetic fields related to scattering at wire boundaries. Theoretically, the influence of boundary scattering on magnetoresistance is calculated on the basis of the Kubo formula in the self-consistent Born approximation. Experimental and theoretical results are in good agreement in the whole magnetic-field range up to 5 T, including oscillations due to depopulation of one-dimensional subbands. Deviations from the classical linear dependence of the maximum position on inverse wire width in narrow quantum wires are explained by the influence of transversal quantization of the electronic states. The analysis of the difference between maximum resistance and zero-field resistance leads to a quadratic dependence on inverse wire width, in agreement with experiment. From the fit of the experimental data, we estimate the width of the disturbed regions at wire boundaries to be of the order of 10 nm.

  • Received 5 October 1992

DOI:https://doi.org/10.1103/PhysRevB.47.6524

©1993 American Physical Society

Authors & Affiliations

S. Block, M. Suhrke, and S. Wilke

  • Institut für Theoretische Physik, Humboldt-Universität zu Berlin, Invalidenstrasse 110, O-1040 Berlin, Germany

A. Menschig and H. Schweizer

  • 4. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, W-7000 Stuttgart 80, Germany

D. Grützmacher

  • Institut für Halbleitertechnik, Rheinisch-Westfälische Technische Hochschule Aachen, W-5100 Aachen 1, Germany

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Vol. 47, Iss. 11 — 15 March 1993

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