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  Probing the interatomic potential of solids with strong-field nonlinear phononics

von Hoegen, A., Mankowsky, R., Fechner, M., Först, M., & Cavalleri, A. (2018). Probing the interatomic potential of solids with strong-field nonlinear phononics. Nature, 555, 79-82. doi:10.1038/nature25484.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-89C8-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-C22E-0
Genre: Journal Article

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 Creators:
von Hoegen, A.1, Author              
Mankowsky, R.1, Author              
Fechner, M.1, Author              
Först, M.1, Author              
Cavalleri, A.1, 2, 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              
2Department of Physics, Clarendon Laboratory, University of Oxford, ou_persistent22              

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 Abstract: Nonlinear optical techniques at visible frequencies have long been applied to condensed matter spectroscopy. However, because many important excitations of solids are found at low energies, much can be gained from the extension of nonlinear optics to mid-infrared and terahertz frequencies. For example, the nonlinear excitation of lattice vibrations has enabled the dynamic control of material functions. So far it has only been possible to exploit secondorder phonon nonlinearities at terahertz field strengths near one million volts per centimetre. Here we achieve an order-of-magnitude increase in field strength and explore higher-order phonon nonlinearities. We excite up to five harmonics of the A1 (transverse optical) phonon mode in the ferroelectric material lithium niobate. By using ultrashort mid-infrared laser pulses to drive the atoms far from their equilibrium positions, and measuring the largeamplitude atomic trajectories, we can sample the interatomic potential of lithium niobate, providing a benchmark for ab initio calculations for the material. Tomography of the energy surface by high-order nonlinear phononics could benefit many aspects of materials research, including the study of classical and quantum phase transitions.

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Language(s): eng - English
 Dates: 2018-02-212018-03-01
 Publication Status: Published in print
 Pages: 3
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 Rev. Method: Peer
 Identifiers: DOI: 10.1038/nature25484
arXiv: 1708.07659
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Project name : European Research Council under the European Union’s Seventh Framework Programme (FP7/2007–2013)/ERC Grant Agreement No. 319286 (QMAC). We acknowledge support from the Deutsche Forschungsgemeinschaft via the excellence cluster ‘The Hamburg Centre for Ultrafast Imaging—Structure, Dynamics and Control of Matter at the Atomic Scale’ and the Priority Program SFB925 ‘Light induced Dynamics and Control of Correlated Quantum Systems’.
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Title: Nature
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Publ. Info: Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
Pages: 3 Volume / Issue: 555 Sequence Number: - Start / End Page: 79 - 82 Identifier: -