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Terahertz-driven phonon upconversion in SrTiO 3

  • Kozina, M. Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
  • Fechner, M. Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
  • Marsik, Premysl Department of Physics, University of Fribourg, Switzerland
  • Driel, T. van Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
  • Glownia, J. M. Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
  • Bernhard, Christian Department of Physics, University of Fribourg, Switzerland
  • Radovic, M. Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland
  • Zhu, D. Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
  • Bonetti, S. Department of Physics, Stockholm University, Stockholm, Sweden
  • Staub, U. Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland
  • Hoffmann, M. C. Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
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    2019
Published in:
  • Nature Physics. - 2019, vol. 15, no. 4, p. 387–392
English 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.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/307814
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