Ultrafast coupled electronic and lattice dynamics in exciton self-trapping: Correlation of the localization length and acoustic phonon dynamics

2010 ◽  
Author(s):  
J.G. Mance ◽  
F.X. Morrissey ◽  
A.D. Van Pelt ◽  
S.L. Dexheimer
Keyword(s):  
Lattice Dynamics ◽  
Acoustic Phonon ◽  
Localization Length ◽  
Phonon Dynamics ◽  
Self Trapping

scholarly journals Acoustic phonon lifetimes limit thermal transport in methylammonium lead iodide

2018 ◽  
Vol 115 (47) ◽  
pp. 11905-11910 ◽  
Author(s):  
Aryeh Gold-Parker ◽  
Peter M. Gehring ◽  
Jonathan M. Skelton ◽  
Ian C. Smith ◽  
Dan Parshall ◽  
...  
Keyword(s):  
Lattice Dynamics ◽  
Acoustic Phonon ◽  
Optoelectronic Devices ◽  
High Energy ◽  
High Energy Resolution ◽  
Phonon Coupling ◽  
Lead Iodide ◽  
Phonon Modes ◽  
Electron Phonon Coupling ◽  
Methylammonium Lead Iodide

Hybrid organic–inorganic perovskites (HOIPs) have become an important class of semiconductors for solar cells and other optoelectronic applications. Electron–phonon coupling plays a critical role in all optoelectronic devices, and although the lattice dynamics and phonon frequencies of HOIPs have been well studied, little attention has been given to phonon lifetimes. We report high-precision momentum-resolved measurements of acoustic phonon lifetimes in the hybrid perovskite methylammonium lead iodide (MAPI), using inelastic neutron spectroscopy to provide high-energy resolution and fully deuterated single crystals to reduce incoherent scattering from hydrogen. Our measurements reveal extremely short lifetimes on the order of picoseconds, corresponding to nanometer mean free paths and demonstrating that acoustic phonons are unable to dissipate heat efficiently. Lattice-dynamics calculations using ab initio third-order perturbation theory indicate that the short lifetimes stem from strong three-phonon interactions and a high density of low-energy optical phonon modes related to the degrees of freedom of the organic cation. Such short lifetimes have significant implications for electron–phonon coupling in MAPI and other HOIPs, with direct impacts on optoelectronic devices both in the cooling of hot carriers and in the transport and recombination of band edge carriers. These findings illustrate a fundamental difference between HOIPs and conventional photovoltaic semiconductors and demonstrate the importance of understanding lattice dynamics in the effort to develop metal halide perovskite optoelectronic devices.

scholarly journals Coherent magnon and acoustic phonon dynamics in tetragonal and rare-earth-doped BiFeO3multiferroic thin films

2013 ◽  
Vol 88 (9) ◽  
Author(s):  
K. I. Doig ◽  
F. Aguesse ◽  
A. K. Axelsson ◽  
N. M. Alford ◽  
S. Nawaz ◽  
...  
Keyword(s):  
Thin Films ◽  
Rare Earth ◽  
Acoustic Phonon ◽  
Phonon Dynamics ◽  
Rare Earth Doped

scholarly journals Acoustic phonon dynamics in thin-films of the topological insulator Bi2Se3

2015 ◽  
Vol 117 (16) ◽  
pp. 165703 ◽  
Author(s):  
Yuri D. Glinka ◽  
Sercan Babakiray ◽  
Trent A. Johnson ◽  
Mikel B. Holcomb ◽  
David Lederman
Keyword(s):  
Thin Films ◽  
Topological Insulator ◽  
Acoustic Phonon ◽  
Phonon Dynamics

Temperature evolution of pentacene crystal structure and phonon dynamics

2002 ◽  
Vol 725 ◽  
Author(s):  
Matteo Masino ◽  
Alberto Girlando ◽  
Raffaele G. Della Valle ◽  
Elisabetta Venuti ◽  
Luca Farina ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
Lattice Dynamics ◽  
Low Frequency ◽  
Minimum Potential Energy ◽  
X Ray ◽  
Phonon Dynamics ◽  
Minimum Potential ◽  
Effects Of Temperature ◽  
Experimental Raman Spectrum

AbstractWe investigate the relationships among all currently known X-ray structures of crystalline pentacene by calculating their “inherent” structures of minimum potential energy. We are thus able to show that two distinct bulk crystalline phases of pentacene exist, with very subtle but clear di.erences. We then assess the effects of temperature on the crystal structures, by including both inter- molecular and low-frequency intra-molecular phonons in the framework of quasi harmonic lattice dynamics methods. In this way we properly reproduce the experimental thermal expansion, and obtain a reliable description of the phonon dynamics and of its temperature dependence. The calculated phonon frequencies compare well with the experimental Raman spectrum.

Direct observation of interlayer coherent acoustic phonon dynamics in bilayer and few-layer PtSe2

2019 ◽  
Vol 7 (12) ◽  
pp. 1416 ◽  
Author(s):  
Xin Chen ◽  
Saifeng Zhang ◽  
Lei Wang ◽  
Yi-Fan Huang ◽  
Huiyan Liu ◽  
...  
Keyword(s):  
Direct Observation ◽  
Acoustic Phonon ◽  
Phonon Dynamics ◽  
Coherent Acoustic Phonon
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