Electron-phonon coupling in the B820 subunit form of LH1 studied by temperature dependence of optical spectra

1994 ◽  
Vol 58 (1-6) ◽  
pp. 168-171 ◽  
Author(s):  
T. Pullerits ◽  
F. van Mourik ◽  
R. Monshouwer ◽  
R.W. Visschers ◽  
R. van Grondelle
Keyword(s):  
Temperature Dependence ◽  
Optical Spectra ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

scholarly journals The effect of strong electron-rattling phonon coupling on some superconducting properties

2019 ◽  
Vol 97 (5) ◽  
pp. 472-476
Author(s):  
Samin Tajik ◽  
Božidar Mitrović ◽  
Frank Marsiglio
Keyword(s):  
Temperature Dependence ◽  
Coupling Parameter ◽  
Nmr Relaxation ◽  
Superconducting Gap ◽  
Phonon Coupling ◽  
Phonon Modes ◽  
Strong Electron ◽  
Particle Decay ◽  
Electron Phonon Coupling ◽  
The One

Using the Eliashberg theory of superconductivity we have examined several properties of a model in which electrons are coupled only to rattling phonon modes represented by a sharp peak in the electron–phonon coupling function. Our choice of parameters was guided by experiments on β-pyrochlore oxide superconductor KOs2Os6. We have calculated the temperature dependence of the superconducting gap edge; the quasi-particle decay rate; the NMR relaxation rate assuming that the coupling between the nuclear spins and the conduction electrons is via a contact hyperfine interaction, which would be appropriate for the O-site in KOs2Os6; and the microwave conductivity. We examined the limit of very strong coupling by considering three values of the electron–phonon coupling parameter λ = 2.38, 3, and 5 and did not assume that the rattler frequency Ω0 is temperature dependent in the superconducting state. We obtained a very unusual temperature dependence of the superconducting gap edge Δ(T), very much like the one extracted from photoemission experiments on KOs2O6.

The temperature dependence of vibronic lineshapes: Linear electron-phonon coupling

2014 ◽  
Vol 141 (15) ◽  
pp. 154110 ◽  
Author(s):  
Claudia Roos ◽  
Andreas Köhn ◽  
Jürgen Gauss ◽  
Gregor Diezemann
Keyword(s):  
Temperature Dependence ◽  
Linear Electron ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

scholarly journals Accurate Model for Temperature Dependence of Solar Cell Performance According to Phonon Energy Correction

2018 ◽  
Vol 55 (5) ◽  
pp. 15-25 ◽  
Author(s):  
Y. Tiandho ◽  
W. Sunanda ◽  
F. Afriani ◽  
A. Indriawati ◽  
T. P. Handayani
Keyword(s):  
Solar Cell ◽  
Temperature Dependence ◽  
Cell Performance ◽  
Bandgap Energy ◽  
Phonon Coupling ◽  
Solar Cell Performance ◽  
Coupling Interaction ◽  
Electron Phonon Coupling ◽  
Increasing Temperature ◽  
Electron Phonon Coupling Interaction

Abstract In many experiments, it has been reported that the performance of solar cells decreases with increasing temperature. This effect arises due to an increase in the intrinsic carrier concentration of material that directly affects the reverse saturation currents (J0). As a result, the open circuit voltage which is inversely proportional to J0 will decrease quite rapidly with increasing temperature. The intrinsic carrier concentration is determined by the bandgap energy of a material and its temperature. The Varshni relationship is a relation for the variation of the bandgap energy with temperature in semiconductors that has been used extensively in the model of a solar cell performance. But the problem is the Varshni relation just calculates the contribution of the vibrational part at the temperature, which is much greater than the Debye temperature. These works proposed a model of temperature dependence of solar cell performance that involves phonon energy correction and electron-phonon coupling interaction. This correction is applied because the electron-phonon coupling interaction is an intrinsic interaction of semiconductors. The existence of interaction cannot be avoided either experimentally or theoretically. The proposed model is compared with experimental data, which have fairly high accuracy.

scholarly journals Impact of electron-phonon coupling on near-field optical spectra in graphene

2013 ◽  
Vol 87 (4) ◽  
Author(s):  
J. P. Carbotte ◽  
J. P. F. LeBlanc ◽  
Phillip E. C. Ashby
Keyword(s):  
Near Field ◽  
Optical Spectra ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

Contrasting temperature dependence of the band gap in CH3NH3PbX3 (X=I, Br, Cl) : Insight from lattice dilation and electron-phonon coupling

2020 ◽  
Vol 102 (8) ◽  
Author(s):  
Rishabh Saxena ◽  
Jiban Kangsabanik ◽  
Ayush Kumar ◽  
Aga Shahee ◽  
Shivam Singh ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Band Gap ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Lattice Dilation

Free Excitons in GaN

1996 ◽  
Vol 1 ◽  
Author(s):  
B. Monemar ◽  
J.P. Bergman ◽  
I.A. Buyanova ◽  
W. Li ◽  
H. Amano ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Free Exciton ◽  
Optical Spectra ◽  
Phonon Coupling ◽  
Epitaxial Strain

Optical spectra on free exciton properties for GaN are presented and discussed, in particular the influence of epitaxial strain and temperature. The exciton-phonon coupling is also manifested via the temperature dependence of the LO phonon replicas of the free exciton.

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