Landolt-Börnstein - Group III Condensed Matter

Electronic Transport. Part 1: Quantum Point Contacts and Quantum Wires · 5 Applications

Abstract

This chapter discusses applications of quantum point contact (QPC) in transport and high frequency devices. One device proposal to exploit the 1D transport properties relies upon the modulation of the velocity in the high-bias limit due to an increased optical-phonon scattering. The application of a metallic QPC as an analog switching device has been successfully demonstrated in the low-frequency regime by modulating the device conductance between the tunneling and quantized conductance states. The basic building block for these electronic devices is a QPC with a tunable metallic island within the channel, which acts as a gate to modulate the width and hence the number of conducting modes of the device. The application of a sinusoidal signal to the island-gate which results in a comparable modulation of the channel width but in a digital variation of the channel conductance is illustrated. The most promising application for ballistic QPCs is to be found however not in their low-temperature conductance properties but rather in the non-linear current-voltage characteristics in the high-bias limit. The chapter also illustrates the low-temperature mixing spectrum of an impedance matched QPC and gate voltage dependence of the second order mixing product. The mixing power and the conversion loss for a parallel configuration of 155 QPCs are shown. A most promising high-frequency device is the single electron current standard based upon the interaction of surface acoustic waves with QPCs. The first conductance plateau in the acoustoelectric current for varying surface acoustic wave power is given.

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Title
Electronic Transport. Part 1: Quantum Point Contacts and Quantum Wires · 5 Applications
Book Title
Electronic Transport. Part 1: Quantum Point Contacts and Quantum Wires
In
II Quantum point contacts
Book DOI
10.1007/b55682
Chapter DOI
10.1007/10479560_31
Part of
Landolt-Börnstein - Group III Condensed Matter
Volume
34B1
Editors
  • B. Kramer
  • Authors
  • D. Wharam
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