scholarly journals Two Topics of Optical Excitation Dynamics, Newly Unveiled by the Time- and Momentum-Resolved Photo-Electron Emission from the Conduction Band of GaAs: A Theoretical Review

2018 ◽  
Vol 8 (10) ◽  
pp. 1788
Author(s):  
Hiromasa Ohnishi ◽  
Norikazu Tomita
Keyword(s):  
Conduction Band ◽  
Electron Emission ◽  
Selection Rule ◽  
Optical Excitation ◽  
Phonon Coupling ◽  
Relaxation Dynamics ◽  
Infinite Time ◽  
Electron Phonon Coupling ◽  
Franck Condon ◽  
Restricted Selection

We review the recent two topics of optical excitation and relaxation dynamics, newly unveiled by the time- and momentum-resolved photo-electron emission from the conduction band of GaAs. One is the real-time collective relaxation dynamics, resulting in the Fermi degeneracy formation in the Γ valley. We show that it takes almost infinite time to realize the exact Fermi degeneracy, due to a restricted selection rule for the intravalley transition of the photo-excited electrons. The other is the spontaneous and instantaneous intervalley transition from the Γ valley to the L one. By considering the electron-phonon coupling before the photo-excitation, such spontaneous intervalley transition is realized within the framework of the Franck–Condon principle of the photo-excitation.

Giant Electron–Phonon Coupling and Deep Conduction Band Resonance in Metal Halide Double Perovskite

ACS Nano ◽  
2018 ◽  
Vol 12 (8) ◽  
pp. 8081-8090 ◽  
Author(s):  
Julian A. Steele ◽  
Pascal Puech ◽  
Masoumeh Keshavarz ◽  
Ruoxi Yang ◽  
Subhasree Banerjee ◽  
...  
Keyword(s):  
Conduction Band ◽  
Double Perovskite ◽  
Metal Halide ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

Femtosecond relaxation dynamics of electronic processes and electron-phonon coupling in YBa2Cu3O7-? and PrBa2Cu3O7 epitaxial films

1994 ◽  
Vol 96 (1) ◽  
pp. 5-12
Author(s):  
Wen-Sheng Zeng ◽  
Wei-Zhu Lin ◽  
Dang Mo ◽  
F. P. Pi ◽  
Zhong-Ji Xia ◽  
...  
Keyword(s):  
Epitaxial Films ◽  
Phonon Coupling ◽  
Relaxation Dynamics ◽  
Electron Phonon Coupling

Ground and Excited States of the Two and Three Dimensional Bipolaron in a Quantum Dot

2007 ◽  
Vol 546-549 ◽  
pp. 1945-1950
Author(s):  
Yong Hong Ruan ◽  
Guo Wei Pan ◽  
Qing Hu Chen
Keyword(s):  
Excited State ◽  
Quantum Dot ◽  
Excited States ◽  
Lower Energy ◽  
Three Dimensional ◽  
Coupling Constants ◽  
Phonon Coupling ◽  
Excitation Energies ◽  
Electron Phonon Coupling ◽  
Franck Condon

We apply the Lee-Low-Pines-Huybrechts variational method to study the properties of the two and three dimensional bipolaron in a quantum dot. The ground-state (GS) and two types of excited-state energies of the Fröhlich bipolaron for the whole range of electron-phonon coupling constants can be obtained. Compared with the Franck-Condon excited state, the first relaxed excited state has a lower energy. Effects of quantum dot confinement on the excitation energies of the bipolaron are given.

Observation of Core Phonon in Electron–Phonon Coupling in Au25 Nanoclusters

2021 ◽  
Vol 12 (6) ◽  
pp. 1690-1695
Author(s):  
Zhongyu Liu ◽  
Yingwei Li ◽  
Wonyong Shin ◽  
Rongchao Jin
Keyword(s):  
Phonon Coupling ◽  
Electron Phonon Coupling

scholarly journals Electron-phonon coupling in the magnetic Weyl semimetal ZrCo2Sn

2021 ◽  
Vol 103 (2) ◽  
Author(s):  
I.Yu. Sklyadneva ◽  
R. Heid ◽  
P. M. Echenique ◽  
E. V. Chulkov
Keyword(s):  
Phonon Coupling ◽  
Weyl Semimetal ◽  
Electron Phonon Coupling

scholarly journals Dielectric screening in perovskite photovoltaics

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Rui Su ◽  
Zhaojian Xu ◽  
Jiang Wu ◽  
Deying Luo ◽  
Qin Hu ◽  
...  
Keyword(s):  
Open Circuit Voltage ◽  
Low Voltage ◽  
Power Conversion ◽  
Surface Recombination ◽  
Open Circuit ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Dielectric Screening ◽  
Perovskite Photovoltaic ◽  
Reduced Surface

AbstractThe performance of perovskite photovoltaics is fundamentally impeded by the presence of undesirable defects that contribute to non-radiative losses within the devices. Although mitigating these losses has been extensively reported by numerous passivation strategies, a detailed understanding of loss origins within the devices remains elusive. Here, we demonstrate that the defect capturing probability estimated by the capture cross-section is decreased by varying the dielectric response, producing the dielectric screening effect in the perovskite. The resulting perovskites also show reduced surface recombination and a weaker electron-phonon coupling. All of these boost the power conversion efficiency to 22.3% for an inverted perovskite photovoltaic device with a high open-circuit voltage of 1.25 V and a low voltage deficit of 0.37 V (a bandgap ~1.62 eV). Our results provide not only an in-depth understanding of the carrier capture processes in perovskites, but also a promising pathway for realizing highly efficient devices via dielectric regulation.

scholarly journals Structural phase transition and superconductivity hierarchy in 1T-TaS2 under pressure up to 100 GPa

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Qing Dong ◽  
Quanjun Li ◽  
Shujia Li ◽  
Xuhan Shi ◽  
Shifeng Niu ◽  
...  
Keyword(s):  
Structural Phase ◽  
Transition Metal Dichalcogenides ◽  
Phonon Coupling ◽  
Structural Phase Transitions ◽  
Strong Electron ◽  
Electron Phonon Coupling ◽  
Increasing Trend ◽  
Metal Dichalcogenides ◽  
Dome Shape ◽  
Enhanced Superconductivity

AbstractThe adoption of high pressure not only reinforces the comprehension of the structure and exotic electronic states of transition metal dichalcogenides (TMDs) but also promotes the discovery of intriguing phenomena. Here, 1T-TaS2 was investigated up to 100 GPa, and re-enhanced superconductivity was found with structural phase transitions. The discovered I4/mmm TaS2 presents strong electron–phonon coupling, revealing a good superconductivity of the nonlayered structure. The P–T phase diagram shows a dome shape centered at ~20 GPa, which is attributed to the distortion of the 1T structure. Accompanied by the transition to nonlayered structure above 44.5 GPa, the superconducting critical temperature shows an increasing trend and reaches ~7 K at the highest studied pressure, presenting superior superconductivity compared to the original layered structure. It is unexpected that the pressure-induced re-enhanced superconductivity was observed in TMDs, and the transition from a superconductor with complicated electron-pairing mechanism to a phonon-mediated superconductor would expand the field of pressure-modified superconductivity.

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