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  Quantum interference between charge excitation paths in a solid-state Mott insulator

Wall, S., Brida, D., Clark, S., Ehrke, H., Jaksch, D., Ardavan, A., et al. (2011). Quantum interference between charge excitation paths in a solid-state Mott insulator. Nature Physics, 7(2), 114-118. doi:10.1038/NPHYS1831.

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Wall, Simon1, Autor           
Brida, D.2, Autor
Clark, S.R.3, Autor
Ehrke, H.P.3, Autor
Jaksch, D.3, Autor
Ardavan, A.L.3, Autor
Bonora, S.2, Autor
Uemura, H.4, Autor
Takahashi, Y.5, Autor
Hasegawa, T.6, Autor
Okamoto, H.6, 7, Autor
Cerullo, G.2, Autor
Cavalleri, A.2, 3, Autor
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, Milano 20133, Italy, ou_persistent22              
3Department of Physics, Clarendon Laboratory, Oxford OX1 3PU, UK, ou_persistent22              
4Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan, ou_persistent22              
5Department of Chemistry, Hokkaido University, Sapporo 060-0810, Japan, ou_persistent22              
6Photonics Research Institute, AIST, Tsukuba 305-8562, Japan, ou_persistent22              
7CREST-JST, Chiyoda-ku, Tokyo 102-0075, Japan , ou_persistent22              

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 Zusammenfassung: Competition between electron localization and delocalization in Mott insulators underpins the physics of strongly correlated electron systems. Photoexcitation, which redistributes charge, can control this many-body process on the ultrafast timescale1, 2. So far, time-resolved studies have been carried out in solids in which other degrees of freedom, such as lattice, spin or orbital excitations3, 4, 5, dominate. However, the underlying quantum dynamics of ‘bare’ electronic excitations has remained out of reach. Quantum many-body dynamics are observed only in the controlled environment of optical lattices6, 7 where the dynamics are slower and lattice excitations are absent. By using nearly single-cycle near-infrared pulses, we have measured coherent electronic excitations in the organic salt ET-F2TCNQ, a prototypical one-dimensional Mott insulator. After photoexcitation, a new resonance appears, which oscillates at 25 THz. Time-dependent simulations of the Mott–Hubbard Hamiltonian reproduce the oscillations, showing that electronic delocalization occurs through quantum interference between bound and ionized holon–doublon pairs.

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Sprache(n): eng - English
 Datum: 2011-02
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1038/NPHYS1831
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Titel: Nature Physics
  Andere : Nat. Phys.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: London : Nature Pub. Group
Seiten: - Band / Heft: 7 (2) Artikelnummer: - Start- / Endseite: 114 - 118 Identifikator: ISSN: 1745-2473
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000025850