Enhanced anharmonic phonon coupling and decay dominated by low‐energy phonons in CdS nanowires

2019 ◽  
Vol 50 (10) ◽  
pp. 1492-1501 ◽  
Author(s):  
Muhammad Faisal Iqbal ◽  
Sara Saeed ◽  
Lingling Wu ◽  
Peng Zhu ◽  
Deliang Wang
Keyword(s):  
Low Energy ◽  
Phonon Coupling ◽  
Cds Nanowires

Anisotropy of electron-phonon coupling in single wurtzite CdS nanowires

2007 ◽  
Vol 91 (17) ◽  
pp. 171911 ◽  
Author(s):  
H. M. Fan ◽  
Z. H. Ni ◽  
Y. P. Feng ◽  
X. F. Fan ◽  
J. L. Kuo ◽  
...  
Keyword(s):  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Cds Nanowires

scholarly journals Dynamics of coherence, localization and excitation transfer in disordered nanorings

2017 ◽  
Vol 19 (38) ◽  
pp. 25996-26013 ◽  
Author(s):  
Alejandro D. Somoza ◽  
Ke-Wei Sun ◽  
Rafael A. Molina ◽  
Yang Zhao
Keyword(s):  
Energy Relaxation ◽  
Excitation Transfer ◽  
Low Energy ◽  
Phonon Coupling ◽  
Transfer Enhancement

We reveal an optimal exciton–phonon coupling in LH2 that suppresses disorder-induced localization and facilitates excitation de-trapping. This excitation transfer enhancement, mediated by environmental phonons, is attributed to energy relaxation toward extended, low energy excitons provided by the precise geometry of the LH2.

Neutron Spectroscopy of Superconducting Fullerides

1992 ◽  
Vol 270 ◽  
Author(s):  
Kosmas Prassides ◽  
Christos Christides ◽  
John Tomkinson ◽  
Matthew J. Rosseinsky ◽  
D. W. Murphy ◽  
...  
Keyword(s):  
Low Temperatures ◽  
High Energy ◽  
Inelastic Neutron ◽  
Low Energy ◽  
Vibrational Modes ◽  
Phonon Coupling ◽  
Phonon Spectra ◽  
Electron Phonon Coupling ◽  
Wide Range ◽  
Mechanism Of Superconductivity

ABSTRACTThe phonon spectra of pristine fullerene, superconducting K3C60 and saturation-doped Rb6C60 measured by inelastic neutron scatteringin the energy range 2.5 - 200 meV at low temperatures reveal substantial broadening of five-fold degenerate Hg intramolecular vibrational modes both in the low-energy radial and the high-energy tangential part of the spectrum. This provides strong evidence for a traditional phonon-mediated mechanism of superconductivity in the fullerides but with an electron-phonon coupling strength distributed over a wide range of energies (33-195 meV) as a result of the finite curvature of the fullerene spherical cage.

scholarly journals Production of Defects in Metals by Collision Cascades: Tem Experiments

1994 ◽  
Vol 373 ◽  
Author(s):  
M. A. Kirk
Keyword(s):  
Low Energy ◽  
Recoil Energy ◽  
Dislocation Loops ◽  
Phonon Coupling ◽  
Loop Formation ◽  
Electron Phonon Coupling ◽  
Fast Neutron Irradiation ◽  
Dilute Alloy ◽  
Specific Metal

AbstractI will review our experimental TEM data on the production of dislocation loops by low energy ion bombardment to low doses, as simulations of similar collision cascades produced by fast neutron irradiation, in various metals and alloys. The dependence of vacancy dislocation loop formation on recoil energy, sample temperature, and specific metal or alloy will be examined. Special emphasis will be placed on the effects of dilute alloy additions. A model for cascade melting will be employed to understand these effects, and will require an examination of the role of electron-phonon coupling in cascade cooling and recrystallization. The formation of interstitial dislocation loops as cascade defects, and the influence of the nearby surfaces in these experiments will be briefly discussed.

scholarly journals Origin of Low- and High-Energy Monopole Collectivity in 132Sn

Universe ◽  
2021 ◽  
Vol 7 (5) ◽  
pp. 145
Author(s):  
Nikolay N. Arsenyev ◽  
Alexey P. Severyukhin
Keyword(s):  
Experimental Data ◽  
Excited States ◽  
Lower Energy ◽  
High Energy ◽  
Wave Functions ◽  
Low Energy ◽  
Phonon Coupling ◽  
Skyrme Interaction ◽  
Separable Approximation ◽  
Hole Interaction

Beginning with the Skyrme interaction, we study the properties of the isoscalar giant monopole resonances (ISGMR) of 132Sn. Using the finite-rank separable approximation for the particle-hole interaction, the coupling between one- and two-phonon terms in the wave functions of excited states is taken into account in very large configurational spaces. The inclusion of the phonon–phonon coupling (PPC) results in the formation of a low-energy 0+ state. The PPC inclusion leads to a fragmentation of the ISGMR strength to lower energy states and also to a higher energy tail. Using the same set of parameters, we describe the available experimental data for the ISGMR characteristics of 118,120,122,124Sn and give a prediction for 126,128,130,132Sn.

Low-energy band structures in light odd- A La isotopes using the quasiparticle-phonon coupling plus rotor approach

2021 ◽  
Vol 103 (4) ◽  
Author(s):  
Z. Housni ◽  
A. Khouaja ◽  
J. Inchaouh ◽  
M. L. Bouhssa ◽  
M. Mouadil ◽  
...  
Keyword(s):  
Energy Band ◽  
Low Energy ◽  
Phonon Coupling ◽  
Band Structures

A "FLAT/STEEP BAND" MODEL FOR SUPERCONDUCTIVITY

2005 ◽  
Vol 19 (01n03) ◽  
pp. 29-36 ◽  
Author(s):  
S. DENG ◽  
A. SIMON ◽  
J. KÖHLER
Keyword(s):  
First Principles ◽  
Electronic Structures ◽  
Electronic States ◽  
Low Energy ◽  
Coupling Constants ◽  
Flat Band ◽  
Band Model ◽  
Phonon Coupling ◽  
Pairwise Interactions ◽  
Electron Phonon Coupling

Based on a viewpoint of chemical pairwise interactions between electrons, a Hamiltonian was proposed for the "flat/steep band" scenario. This model has been studied analytically, and numerically with the first-principles method. With Hg and MgB 2 as examples, we have explained the characteristics of this model and observed peak-like structures of the electron-phonon coupling constants λ(q) in q space. The strong coupling of the "flat band" electrons with phonons has been corroborated by developing a new functional Psib(Φ), through which we can quantitatively compare different electronic states in coupling to a specific phonon. The relevance of our model to an electronic inhomogeneity is also discussed. Investigations on experimental and theoretical low-energy electronic structures of superconductors support our flat/steep scenario.

scholarly journals Photoluminescence and Boosting Electron-phonon Coupling in CdS Nanowires With Variable Sn(IV) Dopant Concentration

2020 ◽  
Author(s):  
Weichang Zhou ◽  
Yuehua Peng ◽  
Yuan Luo ◽  
Xuying Zhong ◽  
Yanling Yin ◽  
...  
Keyword(s):  
Room Temperature ◽  
Phonon Coupling ◽  
One Dimensional ◽  
Scattering Spectrum ◽  
Electron Phonon Coupling ◽  
Decay Profile ◽  
Carrier Interaction ◽  
Cds Nanowires ◽  
Micro Cavity ◽  
Lifetime Decay

Abstract High-quality Sn(IV) doped CdS nanowires were synthesized by a thermal evaporation route. Both XRD and Raman scattering spectrum confirmed the doping effect. The room temperature photoluminescence (PL) demonstrated that both near bandgap emission and discrete trapped-state emission appeared simultaneously and significantly, which were attributed to the strong exciton trapping by impurities and electron-phonon coupling during the light transportation. The PL intensity ratio of near bandgap emission to trapped-state emission could be tune via doped Sn(IV) concentration in the CdS nanowires. It is interesting that the trapped-state emission shows well separated peaks with the assistance of 1LO, 2LO, 4LO phonons, demonstrating the boosting electron-phonon coupling in these doped CdS nanowires. It is interesting that the trapped-state emission shows well separated peaks with the assistance of 1LO, 2LO, 4LO phonons, demonstrating the boosting electron-phonon coupling in these doped CdS nanowires. The influence of Sn(IV) dopant is further revealed by PL lifetime decay profile. The optical micro-cavity also plays an important role on this emission process. Our results will be helpful to the understanding of doping modulated carrier interaction, trapping and recombination in one-dimensional (1D) nanostructures.

Solution of the Eliashberg equations for a very strong electron-phonon coupling with a low-energy cutoff

1995 ◽  
Vol 507 (5) ◽  
pp. 431-450 ◽  
Author(s):  
M. Weger ◽  
B. Barbiellini ◽  
T. Jarlborg ◽  
M. Peter ◽  
G. Santi
Keyword(s):  
Low Energy ◽  
Phonon Coupling ◽  
Eliashberg Equations ◽  
Strong Electron ◽  
Electron Phonon Coupling ◽  
Energy Cutoff
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