Direct Measurement of Anharmonic Decay Channels of a Coherent Phonon.

  title={Direct Measurement of Anharmonic Decay Channels of a Coherent Phonon.},
  author={Samuel W. Teitelbaum and Thomas Henighan and Yijing Huang and Hanzhe Liu and Mason P. Jiang and Diling Zhu and Matthieu Chollet and Takahiro Sato and {\'E}amonn D. Murray and Stephen Fahy and Shane M O'Mahony and Trevor P. Bailey and Ctirad Uher and Mariano Trigo and David A. Reis},
  journal={Physical review letters},
  volume={121 12},
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… 

Figures and Tables from this paper

Cavity control of nonlinear phononics

Nonlinear interactions between phonon modes govern the behavior of vibrationally highly excited solids and molecules. Here, we demonstrate theoretically that optical cavities can be used to control

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

It is shown that the previously inaccessible silent phonon modes can be excited coherently with this mechanism, which is based on nonlinear coupling to an infrared-active Higgs-like phonon mode.

Coherent modulation of the electron temperature and electron–phonon couplings in a 2D material

This work uses femtosecond laser pulses to coherently manipulate the electron and phonon distributions, and their couplings, in the charge-density wave (CDW) material 1T-TaSe2, and demonstrates a promising way to manipulate electron–phonon interactions.

Quantum confinement of coherent acoustic phonons in transferred single-crystalline bismuth nanofilms

Coherent acoustic phonon dynamics in single-crystalline bismuth nanofilms transferred to a glass substrate were investigated with ultrafast pump–probe spectroscopy. Coherent phonon signals were

Measuring non-equilibrium dynamics in complex solids with ultrashort X-ray pulses

A series of recent experiments where femtosecond X-ray diffraction was used to measure dynamics of complex solids through measurement of ultrafast electronic and structural dynamics with X-rays are reviewed.

de Measuring non-equilibrium dynamics in complex solids with ultrashort X-ray pulses

Strong interactions between electrons give rise to the complexity of quantum materials, which exhibit exotic functional properties and extreme susceptibility to external perturbations. A growing

Ultrafast dynamics of spin and orbital correlations in quantum materials: an energy- and momentum-resolved perspective

Time-resolved resonant inelastic X-ray scattering (tr-RIXS) is introduced as a means of measuring the charge, spin and orbital excitations out of equilibrium and first observations of transient antiferromagnetic correlations in quasi two dimensions in a photo-excited Mott insulator are reviewed.

Phase transition in epitaxial bismuth nanofilms

Raman and coherent phonon spectroscopies were used to investigate the thickness-dependent phononic properties of ultrathin single-crystal Bi films prepared by molecular beam epitaxy on Si(111)

Ultrafast light-induced shear strain probed by time-resolved x-ray diffraction: Multiferroic BiFeO3 as a case study

Enabling the light-control of complex systems on ultra-short timescales gives rise to rich physics with promising applications. While crucial, the quantitative determination of both the longitudinal

Probing dynamics in quantum materials with femtosecond X-rays

Optical pulses are routinely used to drive dynamic changes in the properties of solids. In quantum materials, many new phenomena have been discovered, including ultrafast transitions between



Resonant squeezing and the anharmonic decay of coherent phonons

We show that the anharmonic decay of large-amplitude coherent phonons in a solid generates strongly enhanced squeezing of the phonon modes near points of the Brillouin zone where energy conservation

Control of two-phonon correlations and the mechanism of high-wavevector phonon generation by ultrafast light pulses

Impulsive optical excitation can generate both coherent and squeezed phonons. The expectation value of the phonon displacement $ $ oscillates at the mode frequency for the coherent state but remains

Coherent and incoherent structural dynamics in laser-excited antimony

We investigate the excitation of phonons in photoexcited antimony and demonstrate that the entire electron-lattice interactions, in particular coherent and incoherent electron-phonon coupling, can be

Directly observing squeezed phonon states with femtosecond x-ray diffraction.

With femtosecond x-ray diffraction, squeezing oscillations in bismuth are measured and it is concluded that they are consistent with a model in which electronic excitation softens all phonon modes by a constant scaling factor.

Phonon spectroscopy with sub-meV resolution by femtosecond x-ray diffuse scattering

We present a reconstruction of the transverse acoustic phonon dispersion of germanium from femtosecond time-resolved x-ray diffuse scattering measurements at the Linac Coherent Light Source. We

Anharmonic Phonon Lifetimes in Semiconductors from Density-Functional Perturbation Theory.

The basic ingredients are by-products of a standard linear-response calculation of phonon dispersions in the harmonic approximation, resulting in a similarly good agreement with experiments.

Optical probing of ultrafast electronic decay in Bi and Sb with slow phonons.

A combination of ultrafast stimulated and cw spontaneous Raman scattering is used to determine the lifetime of A(1g) and E(g) electronic coherences in Bi and Sb to shed new light on the mechanisms of coherent phonon generation and represent a novel way to probe extremely fast electron decoherence rates.

Vacuum Squeezing of Solids: Macroscopic Quantum States Driven by Light Pulses

Femtosecond laser pulses and coherent two-phonon Raman scattering were used to excite KTaO3 into a squeezed state, nearly periodic in time, in which the variance of the atomic displacements dips

Squeezed phonon states: Modulating quantum fluctuations of atomic displacements.

  • HuNori
  • Physics
    Physical review letters
  • 1996
The squeezed quantum states of phonons are studied, which allow the possibility of modulating the quantum fluctuations of atomic displacements below the zero-point quantum noise level of coherent phonon states, and a detection scheme based on reflectivity measurements is proposed.

Distributions of phonon lifetimes in Brillouin zones

Lattice thermal conductivities of zincblende- and wurtzite-type compounds with 33 combinations of elements are calculated with the single-mode relaxation-time approximation and linearized phonon