| Zugriffsnummer | 29957 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Excitation of single quasiparticles in a small superconducting Al island connected to normal-metal leads by tunnel junctions |
| Autor(in); Institution |
Maisi, V. F.; Aalto University School of Science, Low Temperature Laboratory (OVLL), Aalto, FINLAND; Centre for Metrology and Accreditation (MIKES), Espoo, FINLAND
Lotkhov, Sergey V.; 2.4, Quantenelektronik, PTB-Braunschweig
Kemppinen, Antti; Centre for Metrology and Accreditation (MIKES), Espoo, FINLAND
Heimes, A.; Institut für Theoretische Festkörperphysik, Karlsruher Institut für Technologie, Karlsruhe, GERMANY
Muhonen, J. T.; Aalto University School of Science, Low Temperature Laboratory (OVLL), Aalto, FINLAND; University of New South Wales, Centre for Quantum Computation and Communication Technology, School of Electrical Engineering and Telecommunications, Sydney, AUSTRALIA
Pekola, Jukka P.; Aalto University School of Science, Low Temperature Laboratory (OVLL), Aalto, FINLAND
|
| Quelle/Jahr | Physical Review Letters: 111 (2013), 14, 147001-1 - 147001-5 |
| ISSN | 0031-9007 |
| DOI | |
| Verlag | Ridge, NY: American Physical Society |
| Klassifikationscode | PACS : 74.78.Na ; PACS : 74.20.Rp ; PACS : 74.25.Kc ; PACS : 74.40.Gh |
| Zusammenfassung | 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. |
Zitierung
Maisi, V. F., Lotkhov, S. V., Kemppinen, A., Heimes, A., Muhonen, J. T., & Pekola, J. P. (2013). Excitation of single quasiparticles in a small superconducting Al island connected to normal-metal leads by tunnel junctions. Physical Review Letters, 111(14), 147001-1–147001-5. https://doi.org/10.1103/physrevlett.111.147001