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Multiple junction biasing of superconducting tunnel junction detectors
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View: Figures


Image of FIG. 1.
FIG. 1.

Circuit schematic for magnetic-field free detector biasing. The X’s represent junctions. Applied current splits between the two branches; the same current flows through junctions 2 and 3. The pulse amplifier is shown AC coupled to junction 3. Photon-excited quasiparticles can be read out through junctions 2, 3, or both.

Image of FIG. 2.
FIG. 2.

(a) Hysteretic dynamics for the circuit shown in Fig. 1. is plotted against the voltage for junctions 1 (dotted line), 2, and 3 (both solid lines). is initially increased until the three junctions switch to nonzero voltage; then the current is decreased. At the bias current, junctions 2 and 3 are in the subgap region where they can function as photon detectors; here nearly all the current is flowing through junction 1. (b) I-V curves showing the subgap current for junctions 2 and 3. is plotted versus , solid line, and () dotted line. The two lower curves are for a temperature () and the two upper curves are for (). At the lower temperature, the intersection of the two curves gives the operating point. The heat from a photon coupled to both junctions causes the system to move from A to B, straight up. Heat only coupled to one of the junctions causes it to move to the left.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Multiple junction biasing of superconducting tunnel junction detectors