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PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-4783
DTSTART:20180309T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T021757Z
LAST-MODIFIED:20180308T123353Z
LOCATION:5310 Chamberlin
SUMMARY:Magnetic cooling and On-chip thermometry for nanoelectronics b
 elow 10 mK\, R. G. Herb Condensed Matter Seminar\, Mario Palma
DESCRIPTION:Cooling of nanoelectronic devices below 1mK is a challengi
 ng task\, since the thermal coupling with the dilution refrigerator be
 comes weak at low temperatures and electronic devices are extremely su
 sceptible to external heat leaks such as microwave radiation and elect
 rical noise. Despite these technological challenges\, there is a compl
 etely new world of physics\, which can be explored once low temperatur
 es are achieved. To reach such low temperature we developed a parallel
  network of nuclear refrigerators\, which combines magnetic nuclear re
 frigeration technique with transport setup\, by cooling of single meas
 urement leads. In order to evaluate the cooling capacity of the setup\
 , we developed various on-chip thermometry to read temperature below 1
 0 mK. In particular\, we focused on normal metal-Insulator-superconduc
 tor tunnel junctions\, which are used as primary and secondary thermom
 eter down to 7 mK. Furthermore\, we implemented nuclear refrigeration 
 of Coulomb blockade thermometer\, proving cooling of the device down t
 o 2.8 mK\, which is the lowest temperature ever reported so far in a n
 anoelectronic device.
URL:https://www.physics.wisc.edu/events/?id=4783
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