Theoretical study on electron–phonon coupling factor and electron–ion nonequilibrium process in uranium

2017 ◽  
Vol 24 (2) ◽  
pp. 022703 ◽  
Author(s):  
Zi Li ◽  
Cong Wang ◽  
Jize Zhao ◽  
Wei Kang ◽  
Ping Zhang
Keyword(s):  
Theoretical Study ◽  
Coupling Factor ◽  
Nonequilibrium Process ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

Influence of Inter- and Intraband Transitions to Electron Temperature Decay in Noble Metals After Short-Pulsed Laser Heating

2010 ◽  
Vol 132 (12) ◽  
Author(s):  
Patrick E. Hopkins
Keyword(s):  
Heat Capacity ◽  
Electron Temperature ◽  
Noble Metals ◽  
Coupling Factor ◽  
Phonon Coupling ◽  
Electron Heat Capacity ◽  
Temperature Decay ◽  
Electron Heat ◽  
Electron Phonon Coupling ◽  
Pulsed Laser Heating

This work examines the effects of photonically induced interband excitations from the d-band to states at the Fermi energy on the electron temperature decay in noble metals. The change in the electron population in the d-band and the conduction band causes a change in electron heat capacity and electron-phonon coupling factor. In noble metals, due to the large d-band to Fermi energy separation, the contributions to electron heat capacity and electron-phonon coupling factor of intra- and interband transitions can be separated. The two temperature model describing electron-phonon heat transfer after short-pulsed laser heating is solved using the expressions for heat capacity and electron-phonon coupling factor after intra- and interband excitations, and the predicted electron temperature change of the intra- and interband excited electrons are examined. A critical fluence value is defined that represents the absorbed fluence needed to fill all available states at a given photon energy above the Fermi level. At high absorbed laser fluences and pulse energies greater than the interband transition threshold, the interband and intraband contributions to thermophysical properties differ and are shown to affect temporal electron temperature profiles.

Electron–phonon coupling factor and electron heat capacity of 6H-SiC

2021 ◽  
pp. 1-8
Author(s):  
Wenlong Liao ◽  
Chaohui He ◽  
Huan He ◽  
Shang Tian ◽  
Yurong Bai
Keyword(s):  
Heat Capacity ◽  
Coupling Factor ◽  
Phonon Coupling ◽  
Electron Heat Capacity ◽  
Electron Heat ◽  
Electron Phonon Coupling

Large electronic sputtering yield of nanodimensional Au thin films: Dominant role of thermal conductivity and electron phonon coupling factor

2017 ◽  
Vol 121 (9) ◽  
pp. 095308 ◽  
Author(s):  
Udai B. Singh ◽  
Compesh Pannu ◽  
Dinesh C. Agarwal ◽  
Sunil Ojha ◽  
Saif A. Khan ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Dominant Role ◽  
Coupling Factor ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Sputtering Yield ◽  
Au Thin Films

Contributions of Inter- and Intraband Excitations to Electron Heat Capacity and Electron-Phonon Coupling in Noble Metals

2009 ◽  
Vol 132 (1) ◽  
Author(s):  
Patrick E. Hopkins
Keyword(s):  
Heat Capacity ◽  
Thermophysical Properties ◽  
Fermi Energy ◽  
Noble Metals ◽  
Coupling Factor ◽  
Energy Separation ◽  
Phonon Coupling ◽  
Electron Heat Capacity ◽  
Electron Heat ◽  
Electron Phonon Coupling

This work examines the effects of photonically induced interband excitations from the d-band to states at the Fermi energy on thermophysical properties in noble metals. The change in the electron population in the d-band and the conduction band causes a change in electron heat capacity and electron-phonon coupling factor, which in turn impacts the evolution of the temperature after pulse absorption and electron thermalization. Expressions for heat capacity and electron-phonon coupling factor are derived for electrons undergoing both inter- and intraband transitions. In noble metals, due to the large d-band to Fermi energy separation, the contributions to electron heat capacity and electron-phonon coupling factor of intra- and interband transitions can be separated. At high absorbed laser fluences and pulse energies greater than the interband transition threshold, the interband and intraband contributions to thermophysical properties differ.

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