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junction transition in InAs self-assembled quantum dot coupled with SQUID
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) SEM image of the SQUID coupled with InAs SAQD. Here randomly distributed small dots are InAs SAQDs. For two junctions of Al/SAQD/Al marked as dotted square (J1 and J2), the enlarged images are shown in the right insets. (b) Schematic diagram of our device. (c) Differential conductance as functions of source-drain voltage and BG voltage under the magnetic field of 100 mT and at . (d) The characteristics of SQUID at about 30 mK and in an absence of magnetic field. Here was set to be −0.04 V and grounded.

Image of FIG. 2.
FIG. 2.

oscillation as a function of external magnetic field and . is fixed to be 0V for (a), −0.2 V for (b), and −0.4 V for (c). (d) is enlarged plot of (c) in the range of from −0.08 to −0.25 V. For clarity, line profiles of (blue) and (black) are superimposed with an arbitrary scale.

Image of FIG. 3.
FIG. 3.

profiles of individual junctions in SQUID with varying at fixed 0 V, (b) −0.2 V, and (c) −0.4 V.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: π junction transition in InAs self-assembled quantum dot coupled with SQUID