Photon emission from a driven single-molecule source: A renormalization group approach

The photon emission from a single molecule driven simultaneously by a laser and a slow electric radio frequency (rf) field is studied. We use a non-Hermitian Hamiltonian approach which accounts for the radiative decay of a two-level system modeling the single-molecule source. We apply the renormaliz...

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Published inThe Journal of chemical physics Vol. 123; no. 7; pp. 074703 - 074703-12
Main Authors Rozhkov, Igor, Barkai, E.
Format Journal Article
LanguageEnglish
Published United States American Institute of Physics 15.08.2005
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ISSN0021-9606
1089-7690
1520-9032
1089-7690
DOI10.1063/1.2004879

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Summary:The photon emission from a single molecule driven simultaneously by a laser and a slow electric radio frequency (rf) field is studied. We use a non-Hermitian Hamiltonian approach which accounts for the radiative decay of a two-level system modeling the single-molecule source. We apply the renormalization group method for differential equations to obtain long time solution of the corresponding Schrödinger equation, which allows us to calculate the average waiting time for the first photon emission. Then, we analyze the conditions for suppression and enhancement of photon emission in this dissipative two-level system. In particular we derive a transcendental equation, which yields the nontrivial rf field control parameters, for which enhancement and suppression of photon emission occurs. For finite values of radiative decay rate an abrupt transition to the state when both situations are indistinguishable is found for certain values of the rf field parameters. Our results are shown to be in agreement with the available experiments [ Ch. Brunel , Phys. Rev. Lett. 81 , 2679 ( 1998 ) ].
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ISSN:0021-9606
1089-7690
1520-9032
1089-7690
DOI:10.1063/1.2004879