scholarly journals Four-Wave Mixing in Perovskite Photovoltaic Materials Reveals Long Dephasing Times and Weaker Many-Body Interactions than GaAs

ACS Photonics ◽  
2017 ◽  
Vol 4 (6) ◽  
pp. 1515-1521 ◽  
Author(s):  
Samuel A. March ◽  
Drew B. Riley ◽  
Charlotte Clegg ◽  
Daniel Webber ◽  
Xinyu Liu ◽  
...  
Keyword(s):  
Four Wave Mixing ◽  
Wave Mixing ◽  
Many Body ◽  
Photovoltaic Materials ◽  
Many Body Interactions ◽  
Perovskite Photovoltaic

scholarly journals Parametric amplification of optical phonons

2018 ◽  
Vol 115 (48) ◽  
pp. 12148-12151 ◽  
Author(s):  
A. Cartella ◽  
T. F. Nova ◽  
M. Fechner ◽  
R. Merlin ◽  
A. Cavalleri
Keyword(s):  
Density Functional ◽  
Optical Gain ◽  
Density Functional Theory Calculations ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Many Body ◽  
Microscopic Mechanism ◽  
Lattice Mode ◽  
Many Body Interactions ◽  
Kinetics Of

We use coherent midinfrared optical pulses to resonantly excite large-amplitude oscillations of the Si–C stretching mode in silicon carbide. When probing the sample with a second pulse, we observe parametric optical gain at all wavelengths throughout the reststrahlen band. This effect reflects the amplification of light by phonon-mediated four-wave mixing and, by extension, of optical-phonon fluctuations. Density functional theory calculations clarify aspects of the microscopic mechanism for this phenomenon. The high-frequency dielectric permittivity and the phonon oscillator strength depend quadratically on the lattice coordinate; they oscillate at twice the frequency of the optical field and provide a parametric drive for the lattice mode. Parametric gain in phononic four-wave mixing is a generic mechanism that can be extended to all polar modes of solids, as a means to control the kinetics of phase transitions, to amplify many-body interactions or to control phonon-polariton waves.

Pulse propagation and many-body effects in semiconductor four-wave mixing

1995 ◽  
Vol 51 (16) ◽  
pp. 10601-10609 ◽  
Author(s):  
A. Schulze ◽  
A. Knorr ◽  
S. W. Koch
Keyword(s):  
Pulse Propagation ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Many Body ◽  
Many Body Effects

Many-Body Dipole-Dipole Interactions between Excited Rb Atoms Probed by Wave Packets and Parametric Four-Wave Mixing

2007 ◽  
Vol 99 (14) ◽  
Author(s):  
F. Shen ◽  
J. Gao ◽  
A. A. Senin ◽  
C. J. Zhu ◽  
J. R. Allen ◽  
...  
Keyword(s):  
Wave Packets ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Many Body ◽  
Dipole Interactions

Data-Driven Many-Body Models with Chemical Accuracy for CH4/H2O Mixtures

2020 ◽  
Author(s):  
Marc Riera ◽  
Alan Hirales ◽  
Raja Ghosh ◽  
Francesco Paesani
Keyword(s):  
Liquid Phase ◽  
Quantitative Description ◽  
Liquid Mixtures ◽  
Many Body ◽  
Energy Functions ◽  
Potential Energy Functions ◽  
Dynamics Simulations ◽  
Body Potential ◽  
Small Clusters ◽  
Many Body Interactions

<div> <div> <div> <p>Many-body potential energy functions (PEFs) based on the TTM-nrg and MB-nrg theoretical/computational frameworks are developed from coupled cluster reference data for neat methane and mixed methane/water systems. It is shown that that the MB-nrg PEFs achieve subchemical accuracy in the representation of individual many-body effects in small clusters and enables predictive simulations from the gas to the liquid phase. Analysis of structural properties calculated from molecular dynamics simulations of liquid methane and methane/water mixtures using both TTM-nrg and MB-nrg PEFs indicates that, while accounting for polarization effects is important for a correct description of many-body interactions in the liquid phase, an accurate representation of short-range interactions, as provided by the MB-nrg PEFs, is necessary for a quantitative description of the local solvation structure in liquid mixtures. </p> </div> </div> </div>

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