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Thermally excited tunneling from a metastable electronic state in a single-Cooper-pair transistor
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) SEM micrograph showing the SET electrodes and island. The source (S), drain (D), and gate (G1, with four connected electrodes, and G2) leads are covered by a metallic ground plane. (b) The characteristic, showing the Cooper-pair peak , the JQP peak , and the quasiparticle branch. (c) CBO at 15 mK for up (black, ◼) and down (red/gray, ●) gate sweeps at the JQP peak (, lower trace) showing periodicity and at the Cooper-pair peak (, upper trace) showing periodicity. The data show a hysteretic transition into a trapped charge state with .

Image of FIG. 2.
FIG. 2.

(a) Typical exponential decays into and out of a trap for (in jump, ) and (out jump, ). (b) Capture and escape rates vs gate voltage at 25 mK. The hysteresis region (A) from to is shown as .

Image of FIG. 3.
FIG. 3.

Electronic transitions when sweeping the gate voltage at (electron out of the trap). The arrow shows the sweep direction. (a) The occupancy of the initial state at 25 mK (◯) and 165 mK (red/gray, ◻). (b) Logarithmic plots of and showing the double exponential growth of thermal excitation below the transition and the exponential decay above the transition . Lines show fits to Eq. (2).

Image of FIG. 4.
FIG. 4.

The parameters (●) and (▲) vs the refrigerator temperature . The lines show (solid) and [dotted, allowing for heating (Ref. 19)] for .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Thermally excited tunneling from a metastable electronic state in a single-Cooper-pair transistor