Browsing by Author "Li, LC"

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High-sensitivity microwave vector detection at extremely low-power levels for low-dimensional electron systems
(2004-11-01)
Hsieh, WH
;
Kuan, CH
;
Suen, YW
;
Chang, SY
;
Li, LC
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.