The role of electron–phonon coupling in ultrafast laser heating

2005 ◽  
Vol 17 (1) ◽  
pp. 63-68 ◽  
Author(s):  
J. K. Chen ◽  
W. P. Latham ◽  
J. E. Beraun
Keyword(s):  
Laser Heating ◽  
Ultrafast Laser ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

Heat Transfer Across Metal-Dielectric Interfaces During Ultrafast-Laser Heating

2011 ◽  
Author(s):  
Liang Guo ◽  
Stephen L. Hodson ◽  
Timothy S. Fisher ◽  
Xianfan Xu
Keyword(s):  
Heat Transfer ◽  
Laser Heating ◽  
Ultrafast Laser ◽  
Direct Coupling ◽  
Phonon Coupling ◽  
Coupled Transport ◽  
Dielectric Interface ◽  
Electron Phonon Coupling ◽  
Measurement Results ◽  
Dielectric Interfaces

Heat transfer across a metal-dielectric interface involves coupled transport of electrons and phonons in metal and phonons in dielectric, which can be accomplished by coupling between phonons in metal and dielectric or direct coupling between electrons in metal and phonons in dielectric. Direct electron-phonon coupling across the metal-dielectric interface is neglected in some studies [1, 2] but considered in some others [3–5]. We investigate heat transfer across metal-dielectric interfaces during ultrafast-laser heating by employing transient thermo-reflectance (TTR) measurements on Au-Si samples. With ultrafast-laser heating that creates strong thermal non-equilibrium between electrons and phonons in metal, it is possible to isolate the effect of direct electron-phonon coupling across the interface. Simulation results based on the two-temperature model (TTM) are compared with the measurement results. The comparison shows a strong direct coupling between electrons in metal and phonons in dielectric.

Role of electron–phonon coupling in thermal conductivity of metallic nanofluids

2019 ◽  
Vol 52 (48) ◽  
pp. 485302 ◽  
Author(s):  
Dong-Xing Song ◽  
Yu-Feng Zhang ◽  
Wei-Gang Ma ◽  
Xing Zhang
Keyword(s):  
Thermal Conductivity ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

The role of electron-phonon coupling in femtosecond laser damage of metals

1999 ◽  
Vol 69 (7) ◽  
pp. S99-S107 ◽  
Author(s):  
S.-S. Wellershoff ◽  
J. Hohlfeld ◽  
J. Güdde ◽  
E. Matthias
Keyword(s):  
Femtosecond Laser ◽  
Laser Damage ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

Velocity renormalization in graphene: The role of trigonal warping and electron–phonon coupling effects

2017 ◽  
Vol 31 (30) ◽  
pp. 1750235 ◽  
Author(s):  
B. S. Kandemir ◽  
N. Gökçek
Keyword(s):  
Analytical Solution ◽  
Fermi Velocity ◽  
Combined Effects ◽  
Phonon Coupling ◽  
Strong Anisotropy ◽  
Energy Bands ◽  
Phonon Modes ◽  
Electron Phonon Coupling ◽  
Trigonal Warping

We investigate the combined effects of trigonal warping and electron–phonon interactions on the renormalization of the Fermi velocity in graphene. We present an analytical solution to the associated Fröhlich Hamiltonian describing the interaction of doubly degenerate-optical phonon modes of graphene with electrons in the presence of trigonal warp within the framework of Lee–Low–Pines theory. On the basis of our model, it is analytically shown that in addition to its renormalization, Fermi velocity exhibits strong anisotropy due to the trigonal warping. It is also found that in the regime where the trigonal warp starts, distortion of energy bands emerges due to electron–phonon coupling, and the bands exhibit strong anisotropy.

Extraordinary role of Zn in enhancing thermoelectric performance of Ga-doped n-type PbTe

2022 ◽  
Author(s):  
Zhong-zhen Luo ◽  
Songting Cai ◽  
Shiqiang Hao ◽  
Trevor Bailey ◽  
Yubo Luo ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carrier Concentration ◽  
Lattice Thermal Conductivity ◽  
Thermoelectric Performance ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Ga Doping ◽  
Role Of Zn

Although Ga doping can weaken the electron phonon coupling of n-type PbTe, Ga-doped PbTe has a relatively low carrier concentration (n) and high lattice thermal conductivity (κlat), resulting in a...

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