scholarly journals Energy relaxation of an excited electron gas in quantum wires: Many-body electron-LO-phonon coupling

1996 ◽  
Vol 54 (4) ◽  
pp. 2751-2755 ◽  
Author(s):  
Lian Zheng ◽  
S. Das Sarma
Keyword(s):  
Quantum Wires ◽  
Electron Gas ◽  
Energy Relaxation ◽  
Excited Electron ◽  
Phonon Coupling ◽  
Many Body

scholarly journals Mechanisms of electron-phonon coupling unraveled in momentum and time: The case of soft phonons in TiSe2

2021 ◽  
Vol 7 (20) ◽  
pp. eabf2810
Author(s):  
Martin R. Otto ◽  
Jan-Hendrik Pöhls ◽  
Laurent P. René de Cotret ◽  
Mark J. Stern ◽  
Mark Sutton ◽  
...  
Keyword(s):  
Wave Vector ◽  
Density Wave ◽  
Phonon Coupling ◽  
Many Body ◽  
Soft Zone ◽  
Electron Phonon Coupling ◽  
Underlying Mechanisms ◽  
The Many ◽  
Coupling Phenomena ◽  
Electron Pocket

The complex coupling between charge carriers and phonons is responsible for diverse phenomena in condensed matter. We apply ultrafast electron diffuse scattering to unravel electron-phonon coupling phenomena in 1T-TiSe2 in both momentum and time. We are able to distinguish effects due to the real part of the many-body bare electronic susceptibility, R[χ0(q)], from those due to the electron-phonon coupling vertex, gq, by following the response of semimetallic (normal-phase) 1T-TiSe2 to the selective photo-doping of carriers into the electron pocket at the Fermi level. Quasi-impulsive and wave vector–specific renormalization of soft zone-boundary phonon frequencies (stiffening) is observed, followed by wave vector–independent electron-phonon equilibration. These results unravel the underlying mechanisms driving the phonon softening that is associated with the charge density wave transition at lower temperatures.

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.

scholarly journals An incompressible state of a photo-excited electron gas

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Alexei D. Chepelianskii ◽  
Masamitsu Watanabe ◽  
Kostyantyn Nasyedkin ◽  
Kimitoshi Kono ◽  
Denis Konstantinov
Keyword(s):  
Electron Gas ◽  
Excited Electron
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