Direct Experimental Evidence of the Statistical Nature of the Electron Gas in Superconducting Films
ABSTRACT
In an Nb film an alternate electrical current is partitioned at a Y-shaped obstacle into two splitted beams. The intensity-fluctuation correlation of the two beams (cross-correlation) and the intensity-fluctuation correlation of one beam (auto-correlation) are measured within a low-frequency bandwidth as a function of the incident beam intensity, at temperatures T above or below the temperature Tc of the superconductive transition. The results of these measurements reveal the statistical nature of the electron gas in the normal film and in the superconducting film. The conceptual scheme of the present experiment is a version of the Hanbury Brown and Twiss (HBT) experiment, here adopted for a gas of particles in a solid.
In an Nb film an alternate electrical current is partitioned at a Y-shaped obstacle into two splitted beams. The intensity-fluctuation correlation of the two beams (cross-correlation) and the intensity-fluctuation correlation of one beam (auto-correlation) are measured within a low-frequency bandwidth as a function of the incident beam intensity, at temperatures T above or below the temperature Tc of the superconductive transition. The results of these measurements reveal the statistical nature of the electron gas in the normal film and in the superconducting film. The conceptual scheme of the present experiment is a version of the Hanbury Brown and Twiss (HBT) experiment, here adopted for a gas of particles in a solid.
Cite this paper
Iannuzzi, M. , Lucci, M. and Ottaviani, I. (2014) Direct Experimental Evidence of the Statistical Nature of the Electron Gas in Superconducting Films. Journal of Modern Physics, 5, 1708-1712. doi: 10.4236/jmp.2014.516170.
Iannuzzi, M. , Lucci, M. and Ottaviani, I. (2014) Direct Experimental Evidence of the Statistical Nature of the Electron Gas in Superconducting Films. Journal of Modern Physics, 5, 1708-1712. doi: 10.4236/jmp.2014.516170.
References
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http://dx.doi.org/10.1126/science.284.5412.296
[1] Feynman, R.P. (1970) Lectures on Physics. Addison-Wesley Pu.Co., Reading. [2] Hanbury Brown, R. and Twiss, R.Q. (1956) Nature, 177, 27-29.
http://dx.doi.org/10.1038/177027a0 [3] Iannuzzi, M., Messi, R., Moricciani, D., Orecchini, A., Sacchetti, F., Facchi, P. and Pascazio, S. (2011) Physical Review A, 84, 015601
http://dx.doi.org/10.1103/PhysRevA.84.015601 [4] Schellekens, M., Hoppeler, R., Perrin, A., Viana Gomes, J., Boiron, D., Aspect, A. and Westbrook, C.I. (2005) Science, 310, 648-651.
http://dx.doi.org/10.1126/science.1118024 [5] Jeltes, T., McNamara, J.M., Hogervorst, W., Vassen, W., Krachmalnicoff, V., Schellekens, M., Perrin, A., Chang, H., Boiron, D., Aspect, A. and Westbrook, C.I. (2007) Nature, 445, 402; and references therein.
http://dx.doi.org/10.1038/nature05513 [6] Buttiker, M. (1992) Physical Review B, 46, 12485.
http://dx.doi.org/10.1103/PhysRevB.46.12485 [7] Henny, M., Oberholzer, S., Strunk, C., Heinzel, T., Ensslin, K., Holland, M. and Schonenberger, C. (1999) Science, 284, 296.
http://dx.doi.org/10.1126/science.284.5412.296