Abstract
This project aims to develop a cryogenic system for a UHV (Ultra-High Vacuum) manipulator that is currently under development in our group and that will be installed inside a low temperature scanning tunneling microscope (LT-STM). This advice will be used as a light detector to collect the Luminescence in the STM scan, and since the equipment will operate in low temperatures, it is necessary that this advice also operate in low temperatures so that it won't cause thermal instability which would prefent image acquisition due to thermal drifts.
Highlights
Luminescence in STM can occur due to tunneling current between sample and tip during the sample imaging
This proximity, by radiation, can provoke a thermal instability in the sample and bad data collections due to thermal drift. This project aims to develop a cryogenic system for a UHV manipulator that reach temperatures about 77 K (Liquid Nitrogen flux) until 20 K (Liquid Helium flux), and integrate this advice in a low temperature scanning tunneling microscope (LT-STM)
Through the CFD Autodesk, we have made some thermal simulations of sample and tip model, in order to show the system temperature instability
Summary
Luminescence in STM can occur due to tunneling current between sample and tip during the sample imaging. To collect such light, it is necessary input an advice inside the STM close to the tunnel junction. The problem arises because, in our case, the light collector will stay 300 μm of distance from the sample, and the sample temperature is about 13 K (if cooled by liquid Helium) while the manipulator is about 297 K.
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