title: Probing quantum-mechanical level repulsion in disordered systems by means of time-resolved selectively excited resonance fluorescence.
abstract: We argue that the time-resolved spectrum of selectively-excited resonance fluorescence at low temperature provides a tool for probing the quantum-mechanical level repulsion in the Lifshits tail of the electronic density of states in a wide variety of disordered materials. The technique, based on detecting the fast growth of a fluorescence peak that is redshifted relative to the excitation frequency, is demonstrated explicitly by simulations on linear Frenkel exciton chains.
authors.affiliation: GISC, Departamento de Física de Materiales, Universidad Complutense, E-28040 Madrid, Spain.
authors.forename: A V
authors.initials: AV
authors.lastname: Malyshev
authors.forename: V A
authors.initials: VA
authors.lastname: Malyshev
authors.forename: J
authors.initials: J
authors.lastname: Knoester