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  Optical properties of a vibrationally modulated solid state Mott insulator

Kaiser, S., Clark, S. R., Nicoletti, D., Cotugno, G., Tobey, R. I., Dean, N., et al. (2014). Optical properties of a vibrationally modulated solid state Mott insulator. Scientific Reports, 4: 3823. doi:10.1038/srep03823.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-C328-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-5531-F
Genre: Journal Article

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https://dx.doi.org/10.1038/srep03823 (Publisher version)
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http://arxiv.org/abs/1211.7017 (Preprint)
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 Creators:
Kaiser, S.1, Author              
Clark, S. R., Author
Nicoletti, D.1, Author              
Cotugno, G.1, Author              
Tobey, R. I., Author
Dean, N., Author
Lupi, S., Author
Okamoto, H., Author
Hasegawa, T., Author
Jaksch, D., Author
Cavalleri, A.1, Author              
Affiliations:
1Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              

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Free keywords: Electronic properties and materials; Optical spectroscopy; Molecular electronics
 Abstract: Optical pulses at THz and mid-infrared frequencies tuned to specific vibrational resonances modulate the lattice along chosen normal mode coordinates. In this way, solids can be switched between competing electronic phases and new states are created. Here, we use vibrational modulation to make electronic interactions (Hubbard-U) in Mott-insulator time dependent. Mid-infrared optical pulses excite localized molecular vibrations in ET-F2TCNQ, a prototypical one-dimensional Mott-insulator. A broadband ultrafast probe interrogates the resulting optical spectrum between THz and visible frequencies. A red-shifted charge-transfer resonance is observed, consistent with a time-averaged reduction of the electronic correlation strength U. Secondly, a sideband manifold inside of the Mott-gap appears, resulting from a periodically modulated U. The response is compared to computations based on a quantum-modulated dynamic Hubbard model. Heuristic fitting suggests asymmetric holon-doublon coupling to the molecules and that electron double-occupancies strongly squeeze the vibrational mode.

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Language(s): eng - English
 Dates: 2013-10-082014-01-032014-01-22
 Publication Status: Published online
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1038/srep03823
arXiv: 1211.7017
PMC: PMC3898202
 Degree: -

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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 4 Sequence Number: 3823 Start / End Page: - Identifier: Other: 2045-2322
CoNE: /journals/resource/2045-2322