RT Journal Article T1 Probing quantum-mechanical level repulsion in disordered systems by means of time-resolved selectively excited resonance fluorescence A1 Malyshev, Andrey A1 Knoeste, J. AB 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. PB American Physical Society SN 0031-9007 YR 2007 FD 2007-02-23 LK https://hdl.handle.net/20.500.14352/52167 UL https://hdl.handle.net/20.500.14352/52167 LA eng NO ©American Physical Society.This work was supported by the programs Ramón y Cajal (Ministerio de Ciencia y Tecnología de España) and NanoNed (Dutch Ministry of Economic Affairs). NO program Ramón y Cajal (Ministerio de Ciencia y Tecnología de España) NO NanoNed (Dutch Ministry of Economic Affairs) DS Docta Complutense RD 7 abr 2025