Direct Experimental Evidence of the Statistical Nature of the Electron Gas in Superconducting Films

• 作者: Ivano Ottaviani Mario Iannuzzi Massimiliano Lucci
• 来源期刊: 现代物理(英文)
• 学科: 医学
• 关键词: SUPERCONDUCTIVITY BOSE-CONDENSATION
• 年，卷（期）: 2014,（16）
• 页码范围: 1708-1712
• 页数: 5页
• 分类号: R73

摘要

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.