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Parametric Excitation of an Optically Silent Goldstone-Like Phonon Mode.

  • Juraschek DM Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
  • Meier QN Department of Materials, ETH Zurich, CH-8093 Zürich, Switzerland.
  • Narang P Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
  • 2020-04-04
Published in:
  • Physical review letters. - 2020
General Physics and Astronomy
English It has recently been indicated that the hexagonal manganites exhibit Higgs- and Goldstone-like phonon modes that modulate the amplitude and phase of their primary order parameter. Here, we describe a mechanism by which a silent Goldstone-like phonon mode can be coherently excited, which is based on nonlinear coupling to an infrared-active Higgs-like phonon mode. Using a combination of first-principles calculations and phenomenological modeling, we describe the coupled Higgs-Goldstone dynamics in response to the excitation with a terahertz pulse. Besides theoretically demonstrating coherent control of crystallographic Higgs and Goldstone excitations, we show that the previously inaccessible silent phonon modes can be excited coherently with this mechanism.
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  • English
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hybrid
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https://sonar.ch/global/documents/185297
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