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  Terahertz-driven phonon upconversion in SrTiO3

Kozina, M., Fechner, M., Marsik, P., van Driel, T., Glownia, J. M., Bernhard, C., et al. (2019). Terahertz-driven phonon upconversion in SrTiO3. Nature Physics, 15(4), 387-392. doi:10.1038/s41567-018-0408-1.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0003-5F9B-5 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-0BE3-F
Genre: Journal Article

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 Creators:
Kozina, M.1, Author
Fechner, M.2, Author           
Marsik, P.3, Author
van Driel, T.1, Author
Glownia, J. M.1, Author
Bernhard, C.3, Author
Radovic, M.4, Author
Zhu, D.1, Author
Bonetti, S.5, Author
Staub, U.4, Author
Hoffmann, M. C.1, Author
Affiliations:
1Linac Coherent Light Source, SLAC National Accelerator Laboratory, ou_persistent22              
2Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
3Department of Physics, University of Fribourg, ou_persistent22              
4Swiss Light Source, Paul Scherrer Institut, ou_persistent22              
5Department of Physics, Stockholm University, ou_persistent22              

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 Abstract: Direct manipulation of the atomic lattice using intense long-wavelength laser pulses has become a viable approach to create new states of matter in complex materials. Conventionally, a high-frequency vibrational mode is driven resonantly by a mid-infrared laser pulse and the lattice structure is modified through indirect coupling of this infrared-active phonon to other, lower-frequency lattice modulations. Here, we drive the lowest-frequency optical phonon in the prototypical transition metal oxide SrTiO3 well into the anharmonic regime with an intense terahertz field. We show that it is possible to transfer energy to higher-frequency phonon modes through nonlinear coupling. Our observations are carried out by directly mapping the lattice response to the coherent drive field with femtosecond X-ray pulses, enabling direct visualization of the atomic displacements.

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Language(s): eng - English
 Dates: 2018-07-272018-12-112019-01-212019-04
 Publication Status: Issued
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41567-018-0408-1
arXiv: 1807.10788
 Degree: -

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Project name : Use of the Linac Coherent Light Source, SLAC National Accelerator Laboratory, is supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under contract no. DE-AC02-76SF00515. M.K. and M.C.H. are supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under award no. 2015-SLAC-100238-Funding. U.S. acknowledges support from the National Center of Competence in Research: Ultrafast Science and Technology (NCCR MUST) of the Swiss National Science Foundation. S.B. acknowledges support from the Knut and Alice Wallenberg Foundation. Work at the University of Fribourg was supported by the Schweizer Nationalfonds (SNF) by grant no. 200020-172611. M.K. and M.C.H. extend thanks to W. Chueh and A. Baclig for annealing the sample and to Z. Wu for assistance with the terahertz experiments. M.F. extends thanks to M. Först for fruitful discussions about modelling the STO system.
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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: 15 (4) Sequence Number: - Start / End Page: 387 - 392 Identifier: ISSN: 1745-2473
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000025850