Excitonic Mechanism of Local Phase Transformations by Optical Pumping |
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Authors: | Serguei Brazovskii Natasha Kirova |
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Affiliation: | 1. LPTMS (CNRS-UMR 8626), Université Paris-sud, Bat. 100, 91405, Orsay cedex, France 2. International Institute of Physics, 59078-400, Natal, Rio Grande do Norte, Brazil 3. Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia 4. LPS (CNRS-UMR 8502), Université Paris-sud, Bat. 510, 91405, Orsay cedex, France
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Abstract: | Transformations of cooperative electronic states by impacts of optical pumping and/or electrostatic doping is a new mainstream in physics of correlated systems. Here we present a semi-phenomenological modeling of spatio-temporal effects in a system where the light absorption goes through a channel creating the excitons—intra-molecular ones or bound electron–hole pairs—and finally the condensate of optical excitons feeds and stimulates phase transformations. Interacting with a near-critical order parameter and deformations, the excitons are subject to self-trapping. That locally enhances their density which can surpass a critical value to trigger the phase transformation, even if the mean density is below the required threshold. The model can be used e.g. as a simplified version of optically induced neutral-ionic transitions in organic chain compounds. |
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