Open AccessHigh-sensitivity microwave vector detection at extremely low-power levels for low-dimensional electron systems
Author(s) -
W. H. Hsieh,
Chieh-Hsiung Kuan,
Y. W. Suen,
S.Y. Chang,
L. C. Li,
B C Lee,
C. P. Lee
Publication year - 2004
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.1814797
Subject(s) - coplanar waveguide , microwave , sensitivity (control systems) , amplitude , dipole , materials science , signal (programming language) , electron , phase (matter) , optoelectronics , quantum , physics , nuclear magnetic resonance , optics , electronic engineering , computer science , engineering , quantum mechanics , programming language
We present a high-sensitivity microwave vector detection system for studying the low-dimensional electron system embedded in the gaps of a coplanar waveguide at low temperatures. Using this system, we have achieved 0.005% and 0.001degrees resolutions in amplitude and phase variations, respectively, at 10 GHz in a magnetotransport measurement on a quantum-wire array with an average signal power less than -75 dBm into the sample at 0.3 K. From the measured phase variation, we can distinguish a very tiny change in the induced dipole moment of each quantum wire. (C) 2004 American Institute of Physics
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