Hot-electron effects in InAs nanowire Josephson junctions
The controlled tailoring of the energy distribution in an electron system opens the way to interesting new physics and device concepts, as demonstrated by research on metallic nanodevices during recent years. Here we investigate how Josephson coupling in a superconductor-InAs nanowire junction can be tuned by means of hot-electron injection and we show that a complete suppression of superconductive effects can be achieved using a power as low as 100 pW. Nanowires offer a novel design freedom as they allow axial and radial heterostructures to be defined as well as control over doping profiles, which can be crucial in the development of devices—such as nanorefrigerators—where precisely controlled and predictable energy barriers are mandatory. Our work provides estimates for unknown key thermal and electrical parameters, such as the electron-phonon coupling, in our InAs nanostructures.
KeywordsNanowire hot-electron Josephson effect InAs heat conduction
Unable to display preview. Download preview PDF.
12274_2010_77_MOESM1_ESM.pdf (656 kb)
- de Gennes, P. G. Superconductivity of Metals and Alloys; W. A. Benjamin: New York, 1966.Google Scholar
- Andreev, A. F. The thermal conductivity of the intermediate state in superconductors. Sov. Phys. JETP 1964, 19, 1228–1231.Google Scholar
- Kulik, I. O.; Omelyan’chuk, A. N. Josephson effect in superconductive bridges: Microscopic theory. Fiz. Nizk. Temp. 1978, 4, 296–311 [Sov. J. Low Temp. Phys. 1978, 4, 142–156].Google Scholar
© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2010