Parallel quantum-point-contacts as high-frequency-mixers
作者:
A. G. C. Haubrich,
D. A. Wharam,
H. Kriegelstein,
S. Manus,
A. Lorke,
J. P. Kotthaus,
A. C. Gossard,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 70,
issue 24
页码: 3251-3253
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.119139
出版商: AIP
数据来源: AIP
摘要:
The results of high-frequency mixing experiments performed upon parallel quantum point contacts defined in the two-dimensional electron gas of anAlxGa1−xAs/GaAsheterostructure are presented. The parallel geometry, fabricated using a novel double-resist technology, enables the point-contact device to be impedance matched over a wide frequency range and, in addition, increases the power levels of the mixing signal while simultaneously reducing the parasitic source-drain capacitance. Here, we consider two parallel quantum point-contact devices with 155 and 110 point contacts, respectively; both devices operated successfully at liquid helium and liquid nitrogen temperatures with a minimal conversion loss of 13 dB. ©1997 American Institute of Physics.
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