期刊
NATURE PHYSICS
卷 15, 期 4, 页码 387-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41567-018-0408-1
关键词
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资金
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [2015-SLAC-100238, DE-AC02-76SF00515]
- National Center of Competence in Research: Ultrafast Science and Technology (NCCR MUST) of the Swiss National Science Foundation
- Knut and Alice Wallenberg Foundation
- Schweizer Nationalfonds (SNF) [200020-172611]
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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