Selected Applications
1-
X 50mK
attoCFM II
1.2983
1.2982
1.2981
Confocal Microscopy on Quantum Dots at 50 mK
0
1.2983
1.2983
80
100
1.29810
40
60
gate voltage (mV)
1.29812
1-
X 50mK
1.29808
1.2982
1.2982
1.29806
1.2981
1.2981
0 0
20
20
20
40
60
40
60
gate
voltage
(mV)
gate
voltage
(mV)
80
80
1.29804
100
100
15
30
gate voltage (mV)
A customized attoCFM II module was implemented into a dilution re-
frigerator for the detailed investigation of quantum dots in an ultra-low
temperature environment and magnetic fields of up to 7 T. The figure
shows differential transmission measurements on a InAs quantum dot
embedded in a GaAs matrix at 50 mK. The pronounced deviation from the
lineshape as expected from the quantum confined Stark effect is due to
many-particle interactions.
45
[1] C. Latta, et al., Nature 474, 627 (2011)
1.29812
1.29810
1.29808
1.29806
1.29804
15
30
gate voltage (mV)
45
Photocurrent Measurements on Graphene Devices
Spatially resolved photocurrent measurements on a graphene field-ef-
fect device in the QHE regime are presented to study the distribution
of Landau levels and its relation with macroscopic transport character-
istics [1]. The exceptional stability and the ease of use of the attoCFM
microscope greatly facilitated these measurements and allowed for mea-
suring working devices in magnetic fields from -9 to +9 T.
[1] G. Nazin, Y. Zhang, L. Zhang, E. Sutter, P. Sutter, Nature Physics 6, 870–874 (2010)
attoMICROSCOPY
Sophisticated Tools for Science
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