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Title: Terahertz-driven phonon upconversion in SrTiO3

Journal Article · · Nature Physics

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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1528889
Journal Information:
Nature Physics, Vol. 15, Issue 4; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English

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Terahertz field–induced ferroelectricity in quantum paraelectric SrTiO 3 journal June 2019
Investigation of Phonon Scattering on the Tunable Mechanisms of Terahertz Graphene Metamaterials journal December 2019
Ultrafast transient increase of oxygen octahedral rotations in a perovskite text January 2019
Ultrafast transient increase of oxygen octahedral rotations in a perovskite text January 2019
Ultrafast reversal of the ferroelectric polarization by a midinfrared pulse text January 2019