Construction of a dilution refrigerator cooled scanning force microscope.
We present a scanning force microscope that operates in a dilution refrigerator at temperatures of about 100 mK. We use tuning fork sensors for scanning gate experiments on mesoscopic semiconductor nanostructures. Slip-stick motors allow sample coarse-positioning at base temperature. The construction, thermal anchoring, and a procedure to optimize the settings of the phase-locked loop that we use for sensor control are discussed in detail. We present low-temperature topographic and scanning gate images as examples of successful operation.
Gildemeister
A E
AE
Laboratory of Solid State Physics, ETH Zürich, CH-8093 Zürich, Switzerland. gildemeister@phys.ethz.ch
Ihn
T
T
Barengo
C
C
Studerus
P
P
Ensslin
K
K
D003080:Cold Temperature; D018625:Microscopy, Atomic Force / Q000295:instrumentation / Q000379:methods; D012034:Refrigeration