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Nonequilibrium electronic and structural Jahn-Teller dynamics in (NbSe4)3I

Femtosecond time-resolved optical spectroscopy reveals complex nonequilibrium electronic and structural relaxation dynamics associated with an electronically driven Jahn-Teller (JT) structural phase transition at 274 K in the quasi-one-dimensional semiconductor (NbSe4)3I . The relaxation dynamics of the electronic order parameter η (associated with the JT transition) and accompanying structural relaxation are described using the Landau-Khalatnikov equation, and equations of motion for coupled phonons, respectively.

nonequilibrium dynamics; structural phase transition; femtosecond spectroscopy;

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