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  Photoexcited states in correlated band insulators

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

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-D5E0-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-D5E1-0
Genre: Journal Article

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PhysRevB.98.035113.pdf (Publisher version), 2MB
 
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https://dx.doi.org/10.1103/PhysRevB.98.035113 (Publisher version)
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 Creators:
Dasari, N. R.1, 2, Author              
Eckstein, M.2, Author
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1Theory of Correlated Systems out of Equilibrium, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938296              
2Department of Physics, University of Erlangen-Nuremberg, ou_persistent22              

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 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.

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Language(s): eng - English
 Dates: 2018-06-212018-02-162018-07-112018-07-11
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevB.98.035113
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Project name : We acknowledge fruitful discussions with Y. Mohammed and financial support from ERC Starting Grant No. 716648. The calculations were done at the PHYSnet cluster of the University of Hamburg.
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 98 (3) Sequence Number: 035113 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008