Heiss W.D. (ed.) Quantum dots.. a doorway to - tiera.ru
Heiss W.D. (ed.) Quantum dots.. a doorway to - tiera.ru
Heiss W.D. (ed.) Quantum dots.. a doorway to - tiera.ru
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
56 J.M. Elzerman et al.<br />
V L (V)<br />
-1.02<br />
-1.00<br />
-0.98<br />
-0.96<br />
a<br />
12<br />
22<br />
21<br />
11<br />
01<br />
00<br />
10<br />
-0.15 -0.20 -0.25 -0.30<br />
V PR (V)<br />
Fig. 18. Current through the double quantum dot in the few-electron regime.<br />
(a) IDOT (in logarithmic grayscale) versusVL and VPR in the same region as shown<br />
in Fig. 17b, with VDOT = 100 µV andVSD1 = VSD2 =0.Dott<strong>ed</strong> lines are extract<strong>ed</strong><br />
from Fig. 17b. Dark gray indicates a current flowing, with the darkest regions (in<br />
the bot<strong>to</strong>m left corner) corresponding <strong>to</strong> ∼100 pA. In the light gray regions current<br />
is zero due <strong>to</strong> Coulomb blockade. Inside the dash<strong>ed</strong> square, the last triple points<br />
are faintly visible (∼1 pA). (A smoothly varying background current due <strong>to</strong> a small<br />
leakage current from a gate <strong>to</strong> the 2DEG has been subtract<strong>ed</strong> from all traces.)<br />
(b) Close-up of the region inside the dash<strong>ed</strong> square in (a), showing the last two<br />
triple points before the double dot is completely empty. The current at these triple<br />
points is very small (