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Physical Review E
Four stroke Otto refrigerator cycles with no classical analogue are studied. Extremely short cycle times with respect to the internal time scale of the working medium characterize these refrigerators. Therefore these cycles are termed sudden. The sudden cycles are characterized by the stable limit cycle which is the invariant of the global cycle propagator. During their operation the state of the working medium possesses significant coherence which is not erased in the equilibration segmentsdoi:10.1103/physreve.85.051114 pmid:23004710 fatcat:k25ypnxfkjepzjxo67qkdlfquy