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Superconducting tunneling spectroscopy of a carbon nanotube quantum dot
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10.1063/1.3253705
/content/aip/journal/apl/95/19/10.1063/1.3253705
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/19/10.1063/1.3253705
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) On left, side view of device geometry. On right, SEM image of a typical device, with diagram of the measurement circuit. (b) End-to-end conductance as a function of back gate voltage. (c) Expected energy level spectrum of CNT quantum dot, showing subband mismatch and energy level spacing .

Image of FIG. 2.
FIG. 2.

(a) Differential conductance between the superconducting tunnel probe and an end lead as a function of tunnel bias and back gate voltage (with end-to-end bias ). The Pb superconducting gap, , and the band mismatch, , are labeled. Blue and orange arrows point to signals of elastic and inelastic cotunneling, respectively. Inset: Similar measurement but with an applied magnetic field, showing that the cotunneling lines are absent when superconductivity is destroyed. (b) Expected stability diagram. Red stars indicate excited states. (c) Schematic of one of the possible elastic (left) and inelastic (right) cotunneling processes.

Image of FIG. 3.
FIG. 3.

(a) Differential conductance between the superconducting tunnel probe and an end lead as a function of tunnel bias and back gate voltage with applied between the end leads. Dotted box indicates data used in part (c). Smeared diamonds on the right are due to a lowering of the lead tunnel barriers with gate voltage (an open dot regime). (b) Expected stability diagram. Red lines show new features expected at finite source-drain voltage. (c) Horizontal cut through some of the features inside the gap in A, with data averaged over bias range within dotted box to minimize noise, showing conductance (top) and derived current (bottom) inside the gap (cut shown on linear plot of A, since negative signals were shown as zero in log plot).

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/content/aip/journal/apl/95/19/10.1063/1.3253705
2009-11-10
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Superconducting tunneling spectroscopy of a carbon nanotube quantum dot
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/19/10.1063/1.3253705
10.1063/1.3253705
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