Direct Measurement of Anharmonic Decay Channels of a Coherent Phonon
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford PULSE Inst. Stanford Inst. for Materials and Energy Sciences
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford PULSE Inst.; Stanford Univ., CA (United States). Dept. of Physics
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford PULSE Inst.; Stanford Univ., CA (United States). Dept. of Applied Physics
- Stanford Univ., CA (United States). Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford PULSE Inst.
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
- Imperial College London (United Kingdom). Dept. of Physics. Dept. of Materials
- Tyndall National Inst., Cork (Ireland); Univ. College Cork (Ireland). Dept. of Physics
- Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Physics
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford PULSE Inst. Stanford Inst. for Materials and Energy Sciences; Stanford Univ., CA (United States). Dept. of Applied Physics. Dept. of Photon Science
In this paper, we report channel-resolved measurements of the anharmonic coupling of the coherent $${A}_{1g}$$ phonon in photoexcited bismuth to pairs of high wave vector acoustic phonons. The decay of a coherent phonon can be understood as a parametric resonance process whereby the atomic displacement periodically modulates the frequency of a broad continuum of modes. This coupling drives temporal oscillations in the phonon mean-square displacements at the $${A}_{1g}$$ frequency that are observed across the Brillouin zone by femtosecond x-ray diffuse scattering. Finally, we extract anharmonic coupling constants between the $${A}_{1g}$$ and several representative decay channels that are within an order of magnitude of density functional perturbation theory calculations.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Univ. of Michigan, Ann Arbor, MI (United States); Tyndall National Inst., Cork (Ireland); Univ. College Cork (Ireland)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Science Foundation Ireland (SFI); Irish Research Council
- Grant/Contract Number:
- AC02-76SF00515; SC0008574; 12/IA/1601; GOIPG/2015/2784
- OSTI ID:
- 1475393
- Alternate ID(s):
- OSTI ID: 1471767
- Journal Information:
- Physical Review Letters, Vol. 121, Issue 12; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Measuring non-equilibrium dynamics in complex solids with ultrashort X-ray pulses
|
journal | April 2019 |
Ultrafast dynamics of spin and orbital correlations in quantum materials: an energy- and momentum-resolved perspective
|
journal | April 2019 |
Ultrafast dynamics of spin and orbital correlations in quantum materials: an energy- and momentum-resolved perspective | text | January 2018 |
Similar Records
Electronic heat generation in semiconductors: Non-equilibrium excitation and evolution of zone-edge phonons via electron–phonon scattering in photo-excited germanium
Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering