This has always been something that fascinates me, and I suppose, until now, there hasn't been anything that would allow this to be of practical use.
This report presents the latest advancement in tunneling refrigerator, which might actually be practical for cooling large particles. I like how they use the coulomb blockade junction to ensure that the electrons tunnel through one at a time, and so the "hottest" electrons would have the highest probability to tunnel first.
Another cool report [pun intended]!
Zz.
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