Methoden und Modelle zur makroökonomischen Analyse der produktiven Investitionen
In: Studien, Forschungsberichte, Kolloquien 10
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In: Studien, Forschungsberichte, Kolloquien 10
In: Jahrbuch für Wirtschaftsgeschichte: Economic history yearbook, Band 27, Heft 1-2
ISSN: 2196-6842
In: Pankower Vorträge Heft 191
In: Acta polytechnica: journal of advanced engineering, Band 57, Heft 6, S. 454
ISSN: 1805-2363
We study theoretical models of three coupled wave guides with a <em>PT</em>-symmetric distribution of gain and loss. A realistic matrix model is developed in terms of a three-mode expansion. By comparing with a previously postulated matrix model it is shown how parameter ranges with good prospects of finding a third-order exceptional point (EP3) in an experimentally feasible arrangement of semiconductors can be determined. In addition it is demonstrated that continuous distributions of exceptional points, which render the discovery of the EP3 difficult, are not only a feature of extended wave guides but appear also in an idealised model of infinitely thin guides shaped by delta functions.