Landolt-Börnstein - Group III Condensed Matter

Electronic Transport. Part 1: Quantum Point Contacts and Quantum Wires · 7.5 Impurities

Abstract

This chapter deals with impurities and interactions of single wires. This chapter provides a general introduction and boundary scattering of the impurites. MC traces for different numbers of impurities are illustrated. In quasi-ballistic and ballistic samples, the carriers scatter several times from the boundaries before they suffer a collision with an impurity. However, when some fraction of the boundary scattering is diffusive, this will lead to a reduction of the conductance. At finite magnetic field, the Lorentz force increases a perpendicular component of momentum, and increases a scattering rate with the diffusive boundaries and thus increasing the resistivity. At intermediate magnetic fields, the magnetoresistance exhibits a maximum. In the magnetic-field dependence of the conductance,1D weak localization was observed. Boundary scattering effects were included into weak-localization theory in order to analyse the data. Finally, this chapter discusses electron-electron interaction. When electron-electron interactions are taken into account, corrections to conductivity occur. A correction to resistivity in a magnetic field is proportional to B2. This section mentions a phenomenon due to electron-electron interactions as a Coulomb blockade (CB).

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Title
Electronic Transport. Part 1: Quantum Point Contacts and Quantum Wires · 7.5 Impurities
Book Title
Electronic Transport. Part 1: Quantum Point Contacts and Quantum Wires
In
7 Single wires
Book DOI
10.1007/b55682
Chapter DOI
10.1007/10479560_42
Part of
Landolt-Börnstein - Group III Condensed Matter
Volume
34B1
Editors
  • B. Kramer
  • Authors
  • A. Fechner
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