skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Nonequilibrium superconductivity in optically illuminated tunnel junctions. Technical report

Abstract

In the first chapters, the question of what nonequilibrium quasiparticle energy distribution results from optical illumination on a thin film is addressed. A new technique using tunneling current-voltage characteristics is developed which accurately measures the nonequilibrium quasiparticle occupation function, f(E). The extremely good resolution of this technique is sufficient to compare the experimental situation to contrasting theoretical models of raised temperature (T*) and shifted electro-chemical potential (mu*). Data taken on the Al-PbBi tunnel junctions illuminated for this study are well described by the T* model. Study of illuminated tunnel junctions lead to the discovery of a new thermoelectric effect for tunneling through oxide barriers between metals at different temperatures. The final chapters are devoted to examination of this thermoelectric effect. Two types of experiments were performed to test for the existence of this effect, with positive results. A self-consistent Rothwarf-Taylor model is presented which correctly predicts the sign, magnitude, temperature dependence and laser-power dependence of the thermoelectric current. The thermoelectric effect described here appears to resolve long-standing discrepancies between experimental results and theoretical predictions for a series of point contact experiments.

Authors:
Publication Date:
Research Org.:
Harvard Univ., Cambridge, MA (USA). Div. of Applied Sciences
OSTI Identifier:
6196383
Report Number(s):
AD-A-089520
DOE Contract Number:  
N00014-77-C-0085; N00014-75-C-0648
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; SEMICONDUCTOR JUNCTIONS; SUPERCONDUCTIVITY; SUPERCONDUCTORS; THERMOELECTRICITY; COMPUTERS; EQUILIBRIUM; FABRICATION; FIBER OPTICS; SUBSTRATES; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ELECTRICITY; JUNCTIONS; PHYSICAL PROPERTIES; 420201* - Engineering- Cryogenic Equipment & Devices

Citation Formats

Smith, A D. Nonequilibrium superconductivity in optically illuminated tunnel junctions. Technical report. United States: N. p., 1980. Web.
Smith, A D. Nonequilibrium superconductivity in optically illuminated tunnel junctions. Technical report. United States.
Smith, A D. 1980. "Nonequilibrium superconductivity in optically illuminated tunnel junctions. Technical report". United States.
@article{osti_6196383,
title = {Nonequilibrium superconductivity in optically illuminated tunnel junctions. Technical report},
author = {Smith, A D},
abstractNote = {In the first chapters, the question of what nonequilibrium quasiparticle energy distribution results from optical illumination on a thin film is addressed. A new technique using tunneling current-voltage characteristics is developed which accurately measures the nonequilibrium quasiparticle occupation function, f(E). The extremely good resolution of this technique is sufficient to compare the experimental situation to contrasting theoretical models of raised temperature (T*) and shifted electro-chemical potential (mu*). Data taken on the Al-PbBi tunnel junctions illuminated for this study are well described by the T* model. Study of illuminated tunnel junctions lead to the discovery of a new thermoelectric effect for tunneling through oxide barriers between metals at different temperatures. The final chapters are devoted to examination of this thermoelectric effect. Two types of experiments were performed to test for the existence of this effect, with positive results. A self-consistent Rothwarf-Taylor model is presented which correctly predicts the sign, magnitude, temperature dependence and laser-power dependence of the thermoelectric current. The thermoelectric effect described here appears to resolve long-standing discrepancies between experimental results and theoretical predictions for a series of point contact experiments.},
doi = {},
url = {https://www.osti.gov/biblio/6196383}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {8}
}

Technical Report:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that may hold this item. Keep in mind that many technical reports are not cataloged in WorldCat.

Save / Share: