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Title: Terahertz-driven phonon upconversion in SrTiO 3

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 SrTiO 3 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. Lastly, 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.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3];  [1];  [1]; ORCiD logo [3];  [4];  [1]; ORCiD logo [5]; ORCiD logo [4]; ORCiD logo [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Max Planck Institute for the Structure and Dynamics of Matter, Hamburg (Germany)
  3. Univ. of Fribourg, Fribourg (Switzerland)
  4. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  5. Stockholm Univ., Stockholm (Sweden)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1528889
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 15; Journal Issue: 4; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Kozina, M., Fechner, M., Marsik, P., van Driel, T., Glownia, J. M., Bernhard, C., Radovic, M., Zhu, D., Bonetti, S., Staub, U., and Hoffmann, M. C. Terahertz-driven phonon upconversion in SrTiO3. United States: N. p., 2019. Web. doi:10.1038/s41567-018-0408-1.
Kozina, M., Fechner, M., Marsik, P., van Driel, T., Glownia, J. M., Bernhard, C., Radovic, M., Zhu, D., Bonetti, S., Staub, U., & Hoffmann, M. C. Terahertz-driven phonon upconversion in SrTiO3. United States. doi:10.1038/s41567-018-0408-1.
Kozina, M., Fechner, M., Marsik, P., van Driel, T., Glownia, J. M., Bernhard, C., Radovic, M., Zhu, D., Bonetti, S., Staub, U., and Hoffmann, M. C. Mon . "Terahertz-driven phonon upconversion in SrTiO3". United States. doi:10.1038/s41567-018-0408-1.
@article{osti_1528889,
title = {Terahertz-driven phonon upconversion in SrTiO3},
author = {Kozina, M. and Fechner, M. and Marsik, P. and van Driel, T. and Glownia, J. M. and Bernhard, C. and Radovic, M. and Zhu, D. and Bonetti, S. and Staub, U. and Hoffmann, M. C.},
abstractNote = {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. Lastly, 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.},
doi = {10.1038/s41567-018-0408-1},
journal = {Nature Physics},
number = 4,
volume = 15,
place = {United States},
year = {2019},
month = {1}
}

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