Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.147001
Keywords
-
Categories
Funding
- LTQ CoE grant [250280]
- European Community [238345]
- National Doctoral Programme in Nanoscience (NGS-NANO)
- Academy of Finland [259030]
- Academy of Finland (AKA) [259030, 259030] Funding Source: Academy of Finland (AKA)
Ask authors/readers for more resources
We investigate the dynamics of individual quasiparticle excitations on a small superconducting aluminum island connected to normal metallic leads by tunnel junctions. We find the island to be free of excitations within the measurement resolution. This allows us to show that the residual heating, which typically limits experiments on superconductors, has an ultralow value of less than 0.1 aW. By injecting electrons with a periodic gate voltage, we probe electron-phonon interaction and relaxation down to a single quasiparticle excitation pair, with a measured recombination rate of 16 kHz. Our experiment yields a strong test of BCS theory in aluminum as the results are consistent with it without free parameters.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available