Parallel quantum-point-contacts as high-frequency-mixers
In: Applied Physics Letters, Jg. 70 (1997), Heft 24, S. 3251 - 3253
1997Artikel/Aufsatz in Zeitschrift
Physik (inkl. Astronomie)Fakultät für Physik » Experimentalphysik
Titel:
Parallel quantum-point-contacts as high-frequency-mixers
Autor*in:
Haubrich, A. G. C.;Wharam, D. A.;Kriegelstein, H.;Manus, S.;Lorke, AxelUDE
- GND
- 1042619697
- LSF ID
- 2509
- ORCID
- 0000-0002-0405-7720
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
Erscheinungsjahr:
1997
Abstract:
The results of high-frequency mixing experiments performed upon parallel quantum point contacts defined in the two-dimensional electron gas of an AlxGa1−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.