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

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

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WALL, Simon, Daniele BRIDA, Stephen R. CLARK, Henri P. EHRKE, Dieter JAKSCH, Arzhang ARDAVAN, Sergio BONORA, H. UEMURA, Yukihiro TAKAHASHI, Hiroshi OKAMOTO, Tatsuo HASEGAWA, Giulio CERULLO, Andrea CAVALLERI, 2011. Quantum interference between charge excitation paths in a solid-state Mott insulator. In: Nature physics. 7(2), pp. 114-118. ISSN 1745-2473. eISSN 1745-2481. Available under: doi: 10.1038/nphys1831

@article{Wall2011Quant-29076, title={Quantum interference between charge excitation paths in a solid-state Mott insulator}, year={2011}, doi={10.1038/nphys1831}, number={2}, volume={7}, issn={1745-2473}, journal={Nature physics}, pages={114--118}, author={Wall, Simon and Brida, Daniele and Clark, Stephen R. and Ehrke, Henri P. and Jaksch, Dieter and Ardavan, Arzhang and Bonora, Sergio and Uemura, H. and Takahashi, Yukihiro and Okamoto, Hiroshi and Hasegawa, Tatsuo and Cerullo, Giulio and Cavalleri, Andrea} }

Brida, Daniele Jaksch, Dieter Clark, Stephen R. Quantum interference between charge excitation paths in a solid-state Mott insulator Clark, Stephen R. Jaksch, Dieter Uemura, H. Cerullo, Giulio Wall, Simon Brida, Daniele Takahashi, Yukihiro Cerullo, Giulio Uemura, H. Ehrke, Henri P. Bonora, Sergio Hasegawa, Tatsuo Cavalleri, Andrea Ardavan, Arzhang Okamoto, Hiroshi Hasegawa, Tatsuo Wall, Simon 2011 deposit-license Takahashi, Yukihiro 2014-10-06T09:45:23Z eng Ehrke, Henri P. Bonora, Sergio 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-F<sub>2</sub>TCNQ, 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. Okamoto, Hiroshi Ardavan, Arzhang 2014-10-06T09:45:23Z Cavalleri, Andrea

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