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Title: Direct Measurement of Anharmonic Decay Channels of a Coherent Phonon

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [2];  [4];  [5];  [5];  [5];  [6];  [7];  [7];  [8];  [8];  [1];  [9]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford PULSE Inst. Stanford Inst. for Materials and Energy Sciences
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford PULSE Inst.; Stanford Univ., CA (United States). Dept. of Physics
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford PULSE Inst.; Stanford Univ., CA (United States). Dept. of Applied Physics
  4. Stanford Univ., CA (United States). Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford PULSE Inst.
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
  6. Imperial College London (United Kingdom). Dept. of Physics. Dept. of Materials
  7. Tyndall National Inst., Cork (Ireland); Univ. College Cork (Ireland). Dept. of Physics
  8. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Physics
  9. 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
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (3)

Measuring non-equilibrium dynamics in complex solids with ultrashort X-ray pulses
  • Buzzi, Michele; Först, Michael; Cavalleri, Andrea
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 377, Issue 2145 https://doi.org/10.1098/rsta.2017.0478
journal April 2019
Ultrafast dynamics of spin and orbital correlations in quantum materials: an energy- and momentum-resolved perspective
  • Cao, Y.; Mazzone, D. G.; Meyers, D.
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 377, Issue 2145 https://doi.org/10.1098/rsta.2017.0480
journal April 2019
Ultrafast dynamics of spin and orbital correlations in quantum materials: an energy- and momentum-resolved perspective text January 2018

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