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Probing quantum-mechanical level repulsion in disordered systems by means of time-resolved selectively excited resonance fluorescence

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Publication Date
2007-02-23
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Knoeste, J.
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American Physical Society
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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.
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©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).
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