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Coulomb blockade and Kondo effect in a few-electron silicon/silicon-germanium quantum dot
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10.1063/1.2431760
/content/aip/journal/apl/90/3/10.1063/1.2431760
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/3/10.1063/1.2431760
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color) (a) Low-temperature conductance through the quantum dot showing three Coulomb blockade peaks. The third Coulomb peak, at , has an asymmetric peak shape, the origin of which is discussed in the text. (Inset) Atomic force microscope image of the top gated quantum dot with the gates labeled for reference.(b) A two-dimensional plot of the conductance of the quantum dot as a function of the voltage on the central gate and the source-drain bias . (c) A high-resolution plot of the conductance in the regime of the second and third Coulomb diamonds [as indicated by the square bracket in (b)]. Note, in particular, the sharp resonance lines corresponding to the Coulomb peak at . The white arrow indicates the position of the Kondo resonance.

Image of FIG. 2.
FIG. 2.

(a) Plot of the Coulomb peak (squares) at . The peak is well fit by a Fano line shape (solid line). (b) Temperature dependence of the second and third Coulomb peaks for , 250, and . The height and width of the peak at increase as the temperature is increased. In contrast, the height of the peak with the Fano line shape decreases with increasing temperature, and the peak becomes increasingly symmetric as the temperature increases. (Inset) The temperature dependence of the first Coulomb peak, showing small increases in both height and width as the temperature is increased. The conductance of this peak was measured at the same three temperatures as the main figure.

Image of FIG. 3.
FIG. 3.

(a) Zero bias conductance measured at for perpendicular magnetic fields , 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, and (from top to bottom). The curves are offset for clarity. (b) The extracted peak splitting from (a) as a function of applied magnetic field. The data are well fitted by a line with slope of . (c) The temperature dependence of the zero-bias peak height for , 50, 100, and (from top to bottom). (d) Semilog plot of the peak conductance from (c) as a function of temperature. The height of the zero bias anomaly decreases logarithmically with increasing temperature until the peak is no longer present.

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/content/aip/journal/apl/90/3/10.1063/1.2431760
2007-01-16
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Coulomb blockade and Kondo effect in a few-electron silicon/silicon-germanium quantum dot
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/3/10.1063/1.2431760
10.1063/1.2431760
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