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Photoexcited states in correlated band insulators

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Dasari,  N. R.
Theory of Correlated Systems out of Equilibrium, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Department of Physics, University of Erlangen-Nuremberg;

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PhysRevB.98.035113.pdf
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Citation

Dasari, N. R., & Eckstein, M. (2018). Photoexcited states in correlated band insulators. Physical Review B, 98(3): 035113. doi:10.1103/PhysRevB.98.035113.


Cite as: https://hdl.handle.net/21.11116/0000-0001-D5E0-1
Abstract
We study the photoexcitation dynamics of correlated band insulators, using nonequilibrium dynamical mean-field theory for the ionic Hubbard model. We find two distinct behaviors, depending on the ratio of the on-site interaction U and the bare band gap Δ. For small interactions, the relaxation is characterized by intraband carrier scattering in relatively rigid bands, leading to a nonthermal intermediate state with separate thermal distributions of electrons and holes. This behavior can be viewed as typical for a band insulator with weak interactions. For larger interaction, on the other hand, we observe a strong modification of the electronic spectrum and a filling-in of the gap after photoexcitation, along with a rapid thermalization of the system. The two behaviors therefore provide a dynamical distinction of a correlated band insulator and a band insulator, which can differ even when the spectra of the two systems are similar in equilibrium. The crossover happens when the interaction U is comparable to Δ.