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|Title:||Quantum interference between charge excitation paths in a solid-state Mott insulator|
|Source:||Wall, S., Brida, D., Clark, S.R., Ehrke, H.P., Jaksch, D., Ardavan, A., Bonora, S., Uemura, H., Takahashi, Y., Hasegawa, T., Okamoto, H., Cerullo, G., Cavalleri, A. (2011-02). Quantum interference between charge excitation paths in a solid-state Mott insulator. Nature Physics 7 (2) : 114-118. ScholarBank@NUS Repository. https://doi.org/10.1038/nphys1831|
|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 ultrafast1,2 timescale. So far, time-resolved studies have been carried out in solids in which other degrees of freedom, such as lattice, spin or orbital excitations3-5, dominate. However, the underlying quantum dynamics of bareg 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-F 2 TCNQ, a prototypical one-dimensional Mott insulator. After photoexcitation, a new resonance appears, which oscillates at 25THz. Time-dependent simulations of the Mottg Hubbard Hamiltonian reproduce the oscillations, showing that electronic delocalization occurs through quantum interference between bound and ionized holong doublon pairs. © 2011 Macmillan Publishers Limited. All rights reserved.|
|Source Title:||Nature Physics|
|Appears in Collections:||Staff Publications|
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