Graphene-based Josephson junction microwave bolometer
Sensitive microwave detectors are critical instruments in radioastronomy, dark matter axion searches, and superconducting quantum information science. The conventional strategy towards higher-sensitivity bolometry is to nanofabricate an ever-smaller device to augment the thermal response. However, this direction is increasingly more difficult to obtain efficient photon coupling and maintain the material properties in a device with a large surface-to-volume ratio. Here we advance this concept to an ultimately thin bolometric sensor based on monolayer graphene. To utilize its minute electronic specific heat and thermal conductivity, we develop a superconductor-graphene-superconductor (SGS) Josephson junction bolometer embedded in a microwave resonator of resonant frequency 7.9 GHz with over 99\% coupling efficiency. From the dependence of the Josephson switching current on the operating temperature, charge density, input power, and frequency, we demonstrate a noise equivalent power (NEP) of 7 $\times 10^{-19}$ W/Hz$^{1/2}$, corresponding to an energy resolution of one single photon at 32 GHz and reaching the fundamental limit imposed by intrinsic thermal fluctuation at 0.19 K.
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Gil-Ho Lee (add twitter)
Dmitri K. Efetov (add twitter)
Leonardo Ranzani (add twitter)
Evan D. Walsh (edit)
Thomas A. Ohki (add twitter)
Takashi Taniguchi (add twitter)
Kenji Watanabe (edit)
Philip Kim (add twitter)
Dirk Englund (edit)
Kin Chung Fong (add twitter)
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09/12/19 06:05PM
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enkayenerji: RT @kimlikci_954: Graphene-based Josephson junction microwave bolometer https://t.co/5b6kryXwzI Kızılötesi Termal Dedektörler de (ASELSAN'ı…
kimlikci_954: Graphene-based Josephson junction microwave bolometer https://t.co/5b6kryXwzI Kızılötesi Termal Dedektörler de (ASELSAN'ın da termal nişangahlarda kullandığı) kullanılan mikrobolometreler ve konuyla ilgili grafen bazlı uygulamalar
CondensedPapers: Graphene-based Josephson junction microwave bolometer. https://t.co/zkFX8ErBdQ
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