Regensburg 2002 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 10: Supraleitung: Theorie

TT 10.5: Vortrag

Dienstag, 12. März 2002, 11:15–11:30, H18

Electric field dependence of pairing temperature and tunneling — •Klaus Morawetz — Max-Planck-Institute for the Physics of Complex Systems, Noethnitzer Str. 38, 01187 Dresden, Germany

Using the Bethe-Salpeter equation including high electric fields, the dependence of the critical temperature on the applied field is calculated analytically. The critical temperature of pairing is shown to increase with the applied field strength. This is a new field effect and could provide an explanation of recent experiments on field induced superconductivity. From the field dependence of the Bethe-Salpeter equation, the two–particle bound state solution is obtained as a resonance with a tunneling probability analogous to the WKB solution of a single particle confined in a potential and coupled to the electrical field.