scholarly journals Direct determination of mode-projected electron-phonon coupling in the time domain

Science ◽  
2019 ◽  
Vol 366 (6470) ◽  
pp. 1231-1236 ◽  
Author(s):  
M. X. Na ◽  
A. K. Mills ◽  
F. Boschini ◽  
M. Michiardi ◽  
B. Nosarzewski ◽  
...  
Keyword(s):  
Time Domain ◽  
Phonon Scattering ◽  
Direct Determination ◽  
Spectral Weight ◽  
Characteristic Time Scale ◽  
Phonon Coupling ◽  
Strongly Coupled ◽  
Nonthermal Electrons ◽  
Electron Phonon Coupling ◽  
The Time Domain

Ultrafast spectroscopies have become an important tool for elucidating the microscopic description and dynamical properties of quantum materials. In particular, by tracking the dynamics of nonthermal electrons, a material’s dominant scattering processes can be revealed. Here, we present a method for extracting the electron-phonon coupling strength in the time domain, using time- and angle-resolved photoemission spectroscopy (TR-ARPES). This method is demonstrated in graphite, where we investigate the dynamics of photoinjected electrons at the K¯ point, detecting quantized energy-loss processes that correspond to the emission of strongly coupled optical phonons. We show that the observed characteristic time scale for spectral weight transfer mediated by phonon-scattering processes allows for the direct quantitative extraction of electron-phonon matrix elements for specific modes.

scholarly journals Direct Determination of the Electron-Phonon Coupling Matrix Element in a Correlated System

2010 ◽  
Vol 105 (25) ◽  
Author(s):  
Huajun Qin ◽  
Junren Shi ◽  
Yanwei Cao ◽  
Kehui Wu ◽  
Jiandi Zhang ◽  
...  
Keyword(s):  
Matrix Element ◽  
Direct Determination ◽  
Phonon Coupling ◽  
Coupling Matrix ◽  
Electron Phonon Coupling

Raman scattering from impurities in semiconductors. II. Special cases

1978 ◽  
Vol 56 (5) ◽  
pp. 560-564
Author(s):  
Robert Barrie ◽  
H. -C. Chow
Keyword(s):  
Raman Scattering ◽  
General Result ◽  
Phonon Scattering ◽  
Phonon Coupling ◽  
Strong Electron ◽  
Impurities In Semiconductors ◽  
Electron Phonon Coupling ◽  
Special Cases ◽  
Weak Electron

Special cases of the general result for Raman scattering from an impurity in a semiconductor are discussed. For weak electron–phonon coupling the zero-phonon and one-phonon scattering intensities are derived. For strong electron–phonon coupling a comparison is made between two different approximations that have been previously used.

scholarly journals Electron–Phonon Coupling and Electron–Phonon Scattering in SrVO 3

2021 ◽  
pp. 2004207
Author(s):  
Mathieu Mirjolet ◽  
Francisco Rivadulla ◽  
Premysl Marsik ◽  
Vladislav Borisov ◽  
Roser Valentí ◽  
...  
Keyword(s):  
Phonon Scattering ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Electron Phonon Scattering

scholarly journals Forward Electron–Phonon Scattering in Normal and Superconducting States

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3083-3086 ◽  
Author(s):  
O. V. Dolgov ◽  
O. V. Danylenko ◽  
M. L. Kulić ◽  
V. Oudovenko
Keyword(s):  
Critical Temperature ◽  
Density Of States ◽  
Phonon Scattering ◽  
Phonon Frequency ◽  
Coupling Constant ◽  
Phonon Coupling ◽  
Superconducting Properties ◽  
Electron Phonon Coupling ◽  
D Wave ◽  
Electron Phonon Scattering

The sharp forward electron–phonon (FEP) and impurity (FIS) scattering change the normal and superconducting properties significantly. The pseudo-gap like features are present in the density of states for ω<Ω, where Ω is the phonon frequency. The superconducting critical temperature T c , due to the FEP pairing, is linear with respect to the electron–phonon coupling constant. The FIS impurities are pair weakening for s- and d-wave pairing.

scholarly journals Structural rigidity accelerates quantum decoherence and extends carrier lifetime in porphyrin nanoballs: a time domain atomistic simulation

2020 ◽  
Vol 2 (4) ◽  
pp. 1502-1511
Author(s):  
Ritabrata Sarkar ◽  
Md Habib ◽  
Moumita Kar ◽  
Anup Pramanik ◽  
Sougata Pal ◽  
...  
Keyword(s):  
Time Domain ◽  
Atomistic Simulation ◽  
Quantum Coherence ◽  
Carrier Lifetime ◽  
Quantum Decoherence ◽  
Phonon Coupling ◽  
Electron Hole ◽  
Structural Rigidity ◽  
Electron Phonon Coupling ◽  
Hole Recombination

Structural rigidity assists to weaken the NA electron–phonon coupling, shorten the quantum coherence and thus suppress the dynamics of electron–hole recombination.

scholarly journals Photophysics and spectroscopy of metal particles

2000 ◽  
Vol 72 (1-2) ◽  
pp. 189-197 ◽  
Author(s):  
José H. Hodak ◽  
Arnim Henglein ◽  
Gregory V. Hartland
Keyword(s):  
Transient Absorption ◽  
Classical Mechanics ◽  
Transient Absorption Spectroscopy ◽  
Metal Particles ◽  
Characteristic Time Scale ◽  
Phonon Coupling ◽  
Particle Volume ◽  
Plasmon Band ◽  
Free Electron Density ◽  
Electron Phonon Coupling

This paper describes our recent work using ultrafast laser spectroscopy to examine the fundamental properties of metal particles. Two studies are presented. First, the characteristic time scale for electron-phonon coupling in Au particles with sizes between 2 and 120 nm has been examined by bleach recovery measurements. These experiments show that the coupling between the electrons and phonons is independent of particle size, to within the signal-to-noise of our experiments. We have also used transient absorption spectroscopy to examine the low-frequency "breathing" modes of the Au particles. These modes are impulsively excited by the rapid lattice heating that accompanies electron-phonon coupling. The breathing motion contributes to the transient absorption signal because the position of the plasmon band depends on the free electron density and, thus, the particle volume. The measured frequencies are inversely proportional to the radius, and almost exactly match the predictions of classical mechanics calculations for Au.

scholarly journals Polymerized hybrid perovskites with enhanced stability, flexibility and lattice rigidity

2021 ◽  
Author(s):  
Wenjing Chen ◽  
Yongliang Shi ◽  
Jia Chen ◽  
Pingchuan Ma ◽  
Zhibin Fang ◽  
...  
Keyword(s):  
Phonon Scattering ◽  
Phonon Coupling ◽  
Strong Electron ◽  
Light Emitting ◽  
Electron Phonon Coupling ◽  
External Stresses ◽  
Operation Stability ◽  
Halide Perovskites ◽  
Perovskite Lattice ◽  
Enhanced Stability

Abstract The intrinsic soft lattice nature of organometal halide perovskites (OHPs) makes them very tolerant to defects and ideal candidates for solution-processed optoelectronic devices. However, the soft lattice results in low stability towards external stresses such as heating and humidity, and induces high density of phonons, causing strong electron-phonon coupling. Here, we report solid-state polymerization of OHPs using unsaturated 4-vinylbenzylammonium as organoammonium cations without damaging perovskite structure and its tolerance to defects. The polymerized perovskites show enhanced stability and flexibility. Furthermore, the polymerized 4-vinylbenzylammonium group improves perovskite lattice rigidity substantially, resulting in reduced electron-phonon coupling and non-radiative recombination rate, and enhanced carrier mobility because of suppressed phonon scattering. We finally demonstrate efficient polymerized perovskite based light-emitting diodes with an external quantum efficiency of 23.2% and enhanced operation stability.

scholarly journals Direct time-domain determination of electron-phonon coupling strengths in chromium

2020 ◽  
Vol 102 (4) ◽  
Author(s):  
J. Wingert ◽  
A. Singer ◽  
S. K. K. Patel ◽  
R. Kukreja ◽  
Matthieu J. Verstraete ◽  
...  
Keyword(s):  
Time Domain ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Coupling Strengths
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