Experiments carried out at a temperature of a few millikelvins require efficient thermalization schemes, low-pass filtering of the measurement traces, and low-noise electronics. Here, we report on the modifications to a industrial dilution refrigerator with a base temperature of three.5 mK that allow us to decrease the electron temperature to six.7 mK measured from the Coulomb peak width of a quantum dot gate-defined in an [Al]GaAs heteostructure. We current the design and implementation of a liquid 4He immersion cell tight in opposition to superleaks, implement an revolutionary wiring expertise, and develop optimized transport measurement procedures.
Design and efficiency of an extremely-high vacuum scanning tunneling microscope working at dilution refrigerator temperatures and excessive magnetic fields.
We describe the development and efficiency of a scanning tunneling microscope able to taking maps of the tunneling density of states with sub-atomic spatial decision at dilution refrigerator temperatures and excessive (14 T) magnetic fields. The absolutely ultra-high vacuum system options visible entry to a two-sample microscope stage at the top of a bottom-loading dilution Traceable Ultra Refrigerator/Freezer Thermometer, which facilitates the switch of in situ ready ideas and samples. The two-sample stage allows location of the most effective space of the pattern underneath examine and extends the experiment lifetime.
The profitable thermal anchoring of the microscope, described in element, is confirmed by way of a base temperature studying of 20 mK, alongside with a measured electron temperature of 250 mK. Atomically resolved photos, alongside with complementary vibration measurements, are offered to verify the effectiveness of the vibration isolation scheme in this instrument. Finally, we display that the microscope is able to the identical degree of efficiency as typical machines with extra modest refrigeration by measuring spectroscopic maps at base temperature each at zero subject and in an utilized magnetic subject.
Quantum dot thermometry at extremely-low temperature in a dilution refrigerator with a 4He immersion cell.
Experiments carried out at a temperature of a few millikelvins require efficient thermalization schemes, low-pass filtering of the measurement traces, and low-noise electronics. Here, we report on the modifications to a industrial dilution refrigerator with a base temperature of 3.5 mK that allow us to decrease the electron temperature to six.7 mK measured from the Coulomb peak width of a quantum dot gate-defined in an [Al]GaAs heteostructure. We current the design and implementation of a liquid 4He immersion cell tight in opposition to superleaks, implement an revolutionary wiring expertise, and develop optimized transport measurement procedures.
Design and efficiency of an extremely-high vacuum scanning tunneling microscope working at dilution refrigerator temperatures and excessive magnetic fields.
We describe the development and efficiency of a scanning tunneling microscope able to taking maps of the tunneling density of states with sub-atomic spatial decision at dilution refrigerator temperatures and excessive (14 T) magnetic fields. The absolutely ultra-high vacuum system options visible entry to a two-sample microscope stage at the top of a bottom-loading dilution refrigerator, which facilitates the switch of in situ ready ideas and samples. The two-sample stage allows location of the most effective space of the pattern underneath examine and extends the experiment lifetime.
The profitable thermal anchoring of the microscope, described in element, is confirmed by way of a base temperature studying of 20 mK, alongside with a measured electron temperature of 250 mK. Atomically resolved photos, alongside with complementary vibration measurements, are offered to verify the effectiveness of the vibration isolation scheme in this instrument. Finally, we display that the microscope is able to the identical degree of efficiency as typical machines with extra modest refrigeration by measuring spectroscopic maps at base temperature each at zero subject and in an utilized magnetic subject.