Phases of wave functions and level repulsion |
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| Authors: | W.D. Heiss |
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| Affiliation: | (1) Centre for Nonlinear Studies and Department of Physics, University of the Witwatersrand, PO Wits 2050, Johannesburg South Africa, ZA |
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| Abstract: | Avoided level crossings are associated with exceptional points which are the singularities of the spectrum and eigenfunctions, when considered as functions of a complex coupling parameter. It is shown that the wave function of one state changes sign but not the other, if the exceptional point is encircled in the complex plane. An experimental setup is suggested where this peculiar phase change could be observed. Received: 7 January 1999 / Received in final form: 15 March 1999 |
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| Keywords: | PACS. 03.65.Bz Foundations theory of measurement miscellaneous theories - 02.30.Dk Functions of a complex variable - 84.40.-x Radiowave and microwave |
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