A circuit analysis of an in situ tunable radio-frequency quantum point contact
نویسندگان
چکیده
منابع مشابه
A circuit analysis of an in situ tunable radio-frequency quantum point contact.
A detailed analysis of the tunability of a radio-frequency quantum point contact setup using a C - LCR circuit is presented. We calculate how the series capacitance influences resonance frequency and charge-detector resistance for which matching is achieved as well as the voltage and power delivered to the load. Furthermore, we compute the noise contributions in the system and compare our findi...
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We present a current and charge conserving theory for the low frequency admittance of a quantum point contact. We derive expressions for the electrochemical capacitance and the displacement current. The latter is determined by the emittance which equals the ca-pacitance only in the limit of vanishing transmission. With the opening of channels the capacitance and the emittance decrease in a step...
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15 صفحه اولA radio-frequency tunable active filter
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We report on direct measurements of the electronic shot noise of a quantum point contact at frequencies nu in the range 4-8 GHz. The very small energy scale used ensures energy independent transmissions of the few transmitted electronic modes and their accurate knowledge. Both the thermal energy and the quantum point contact drain-source voltage V_{ds} are comparable to the photon energy hnu le...
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ژورنال
عنوان ژورنال: Review of Scientific Instruments
سال: 2013
ISSN: 0034-6748,1089-7623
DOI: 10.1063/1.4817306