Now showing items 1-3 of 3

    • Avoided level crossings in open quantum systems 

      Eleuch, Hichem; Rotter, Ingrid (WILEY-VCH Verlag, 2012-06-18)
      Openquantum system,levelcrossing, exceptional point,overlapping resonances, complexcoupling between system and environment, width bifurcation. At high level density, two states avoid usually crossing at the critical value ...

      Eleuch, Hichem; Rotterb, Ingrid (Acta Polytechnica, 2014)
      Exceptional points (EPs) determine the dynamics of open quantum systems and cause also PT symmetry breaking in PT symmetric systems. From a mathematical point of view, this is caused by the fact that the phases of the ...
    • Nearby states in non-Hermitian quantum systems II: Three and more states 

      Eleuch, Hichem; Rotter, Ingrid (Springer, 2015-08-24)
      Using the formalism for the description of open quantum systems by means of a non-Hermitian Hamilton operator, we study the occurrence of dynamical phase transitions as well as their relation to the singular exceptional ...