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DTSTAMP:20260419T053807Z
UID:ba2723b9-3dce-46a5-b232-db3beb994a13
DTSTART:20250804T150000
DTEND:20250804T160000
DESCRIPTION:The importance of heat management in nanoscale devices and quan
 tum technologies is becoming increasingly crucial due to the need to maint
 ain very low temperatures.\nThe possibility of using normal metal–insula
 tor–superconductor (NIS) junctions for electron cooling was first propos
 ed in the 1990s\, and thereafter deeply studied.\nQuantum coherent devices
  however\, offer new possibilities for the control of heat fluxes\, such a
 s\nthe exploitation of interference effects (for example through an Aharon
 ov-Bohm phase)\, which can be integrated in conventional devices.\nIn this
  paper\, we propose an electronic refrigerator based on a ballistic “And
 reev interferometer” that allows to reach a maximum cooling power (heat 
 extracted from the colder terminal) per transverse channel up to five orde
 rs of magnitude larger than that of the conventional NIS cooler.\nThis eff
 ect is achieved by exploiting the destructive interference that occurs whe
 n the superconducting phase difference equals $\\pi$. This results in a st
 rongly suppressed charge current below the superconducting gap\, while sti
 ll allowing the extraction of excitations above the gap\, leading to a coo
 ler with enhanced performance. Interestingly\, we find that such a large c
 ooling power per channel enables to reach an electronic temperature close 
 to the theoretical lower bound. Additionally\, we derive an approximate ex
 pression for this bound in the regime of low bath temperatures.\n
LOCATION:ETH Zürich\, Hönggerberg HPF G 6
ORGANIZER:Francesco Cioni
SUMMARY:High performance Andreev interferometer based electronic cooler 
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