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Condensed Matter > Mesoscale and Nanoscale Physics

Title: Parallel Quantum-Point-Contacts as High-Frequency-Mixers

Abstract: We present the results of high-frequency mixing experiments performed upon parallel quantum point-contacts defined in the two-dimensional electron gas of an Al_{x}Ga_{1-x}As/GaAs-heterostructure. 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.
Comments: 4 figures, RevTeX, to be published in the 16 June 1997 issue of Applied Physic Letters
Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
DOI: 10.1063/1.119139
Cite as: arXiv:cond-mat/9705308 [cond-mat.mes-hall]
  (or arXiv:cond-mat/9705308v2 [cond-mat.mes-hall] for this version)

Submission history

From: Alexander Haubrich [view email]
[v1] Fri, 30 May 1997 14:05:19 GMT (209kb)
[v2] Mon, 2 Jun 1997 10:27:02 GMT (209kb)