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

Wall, S., Brida, D., Clark, S. R., Ehrke, H. P., Jaksch, D., Ardavan, A. L., 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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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-1A58-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-0BC8-1
Genre: Journal Article

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http://dx.doi.org/10.1038/nphys1831 (Publisher version)
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http://arxiv.org/abs/0910.3808 (Preprint)
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 Creators:
Wall, S.1, Author
Brida, D.2, Author
Clark, S. R.1, 3, Author
Ehrke, Henri P.1, 4, 5, Author              
Jaksch, D.1, 3, Author
Ardavan, A. L.1, Author
Bonora, S.2, Author
Uemura, H.6, Author
Takahashi, Y.7, Author
Hasegawa, T.8, Author
Okamoto, H.6, 8, 9, Author
Cerullo, G.2, Author
Cavalleri, Andrea1, 4, 5, Author              
Affiliations:
1Department of Physics, Clarendon Laboratory, Oxford OX1 3PU, UK, ou_persistent22              
2IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, Milano 20133, Italy, ou_persistent22              
3Centre for Quantum Technologies, National University of Singapore, Singapore 117543, Singapore, ou_persistent22              
4Condensed Matter Dynamics Division, Max Planck Research Department for Structural Dynamics, Department of Physics, University of Hamburg, External Organizations, ou_2173637              
5CFEL, 22607 Hamburg, Germany, ou_persistent22              
6Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan, ou_persistent22              
7Department of Chemistry, Hokkaido University, Sapporo 060-0810, Japan, ou_persistent22              
8Photonics Research Institute, AIST, Tsukuba 305-8562, Japan, ou_persistent22              
9CREST-JST, Chiyoda-ku, Tokyo 102-0075, Japan , ou_persistent22              

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 Abstract: 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 timescale. So far, time-resolved studies have been carried out in solids in which other degrees of freedom, such as lattice, spin or orbital excitations, 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 lattices 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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Language(s): eng - English
 Dates: 2010-12-092010-06-012010-10-042010-12-052011-02
 Publication Status: Published in print
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/nphys1831
arXiv: 0910.3808
 Degree: -

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Title: Nature Physics
  Other : Nat. Phys.
Source Genre: Journal
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Publ. Info: London : Nature Pub. Group
Pages: - Volume / Issue: 7 (2) Sequence Number: - Start / End Page: 114 - 118 Identifier: ISSN: 1745-2473
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000025850