Wideband superconducting nanotube electrometer

Pasi Häkkinen, Aurélien Fay, Dmitry Golubev, Pasi Lähteenmäki, Pertti Hakonen

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

305 Lataukset (Pure)

Abstrakti

We have investigated the microwave response of nanotube Josephson junctions at 600–900 MHz at microwave powers corresponding to currents from 0 to 2 × I C in the junction. Compared with theoretical modeling, the response of the junctions corresponds well to the lumped element model of resistively and capacitively shunted junction. We demonstrate the operation of these superconducting FETs as charge detectors at high frequencies without any matching circuits. Gate-voltage-induced charge Q G modifies the critical current I C, which changes the effective impedance of the junction under microwave irradiation. This change, dependent on the transfer characteristics dI C/dQ G, modifies the reflected signal and it can be used for wide band electrometry. We measure a sensitivity of 3.1×10−5 e/Hz√ from a sample which has a maximum switching current of 2.6 nA.
AlkuperäiskieliEnglanti
Artikkeli012601
Sivut1-4
Sivumäärä4
JulkaisuApplied Physics Letters
Vuosikerta107
Numero1
DOI - pysyväislinkit
TilaJulkaistu - 2015
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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