Photon-activated electron hopping in a single-electron trap enhanced by Josephson radiationстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 9 июня 2016 г.
Аннотация:Using a Josephson junction interferometer (DC SQUID) as a microwave source for irradiating a single-electron trap, both devices fabricated on the same chip, we study the process of photon-assisted tunneling as an effective mechanism of single photondetection. High sensitivity down to a very small oscillation amplitude v_J ∼ 10 nV ≪ E_activation ≲ hf_J and down to low photon absorption rates Γ ∼ (1–50) Hz, as well as a clear threshold type of operation with an activation energy E_activation ∼ 400 μeV, is demonstrated for the trap with respect to the microwave photons of frequency f_J ∼ (100–200) GHz. Tunable generation is demonstrated with respect to the power and frequency of the microwave signal produced by the SQUID source biased within the subgap voltage range. A much weaker effect is observed at the higher junction voltages along the quasiparticle branch of the I–V curve; this response mostly appears due to the recombination phonons.