scholarly journals Bound-Electron Nonlinearity Beyond the Ionization Threshold

2018 ◽  
Vol 120 (18) ◽  
Author(s):  
J. K. Wahlstrand ◽  
S. Zahedpour ◽  
A. Bahl ◽  
M. Kolesik ◽  
H. M. Milchberg
Keyword(s):  
Ionization Threshold ◽  
Bound Electron

Laser-induced Compton scattering from a bound electron

1992 ◽  
Vol 70 (1) ◽  
pp. 72-77 ◽  
Author(s):  
F. Ehlotzky
Keyword(s):  
Angular Distribution ◽  
Compton Scattering ◽  
Harmonic Generation ◽  
Cross Sections ◽  
Laser Field ◽  
Multiphoton Ionization ◽  
Ionization Threshold ◽  
Powerful Laser ◽  
Bound Electrons ◽  
Bound Electron

We investigate nonrelativistically Compton scattering by an electron bound in hydrogen in a powerful laser field. The corresponding nonlinear rates and cross sections are evaluated in a Keldysh-type of approximation and compared with the rates and cross sections of multiphoton ionization and harmonic generation. We find that multiphoton ionization overshadows Compton scattering by many orders of magnitude, however, Compton scattering may well compete with harmonic generation above the ionization threshold, since, in particular, both processes have the same angular distribution and only odd harmonics can be created by bound electrons, while in bound-free Compton scattering all harmonics will be generated.

scholarly journals Bound Electron Nonlinearity Beyond the Ionization Threshold

2017 ◽  
Author(s):  
J. K. Wahlstrand ◽  
S. Zahedpour ◽  
H. M. Milchberg
Keyword(s):  
Ionization Threshold ◽  
Bound Electron

scholarly journals Ultrafast non-excitonic valley Hall effect in MoS2/WTe2 heterobilayers

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jekwan Lee ◽  
Wonhyeok Heo ◽  
Myungjun Cha ◽  
Kenji Watanabe ◽  
Takashi Taniguchi ◽  
...  
Keyword(s):  
Hall Effect ◽  
Quantitative Information ◽  
Exciton Energy ◽  
Electron Hole ◽  
Kerr Rotation ◽  
Polarized Electrons ◽  
Spatially Resolved ◽  
Long Valley ◽  
Bound Electron ◽  
Valley Hall Effect

AbstractThe valley Hall effect (VHE) in two-dimensional (2D) van der Waals (vdW) crystals is a promising approach to study the valley pseudospin. Most experiments so far have used bound electron-hole pairs (excitons) through local photoexcitation. However, the valley depolarization of such excitons is fast, so that several challenges remain to be resolved. We address this issue by exploiting a unipolar VHE using a heterobilayer made of monolayer MoS2/WTe2 to exhibit a long valley-polarized lifetime due to the absence of electron-hole exchange interaction. The unipolar VHE is manifested by reduced photoluminescence at the MoS2 A exciton energy. Furthermore, we provide quantitative information on the time-dependent valley Hall dynamics by performing the spatially-resolved ultrafast Kerr-rotation microscopy; we find that the valley-polarized electrons persist for more than 4 nanoseconds and the valley Hall mobility exceeds 4.49 × 103 cm2/Vs, which is orders of magnitude larger than previous reports.

Optical properties of metallic sodium tungsten bronzes: Analysis of free- and bound-electron contributions

1977 ◽  
Vol 15 (10) ◽  
pp. 4623-4630 ◽  
Author(s):  
P. Camagni ◽  
A. Manara ◽  
G. Campagnoli ◽  
A. Gustinetti ◽  
A. Stella
Keyword(s):  
Optical Properties ◽  
Metallic Sodium ◽  
Sodium Tungsten ◽  
Bound Electron

scholarly journals Comparison of Iteration Schemes for the Solution of the Multidimensional Schrödinger-Poisson Equations

VLSI Design ◽  
1998 ◽  
Vol 8 (1-4) ◽  
pp. 105-109 ◽  
Author(s):  
A. Trellakis ◽  
A. T. Galick ◽  
A. Pacelli ◽  
U. Ravaioli
Keyword(s):  
Coupled System ◽  
Iteration Scheme ◽  
Simple Expression ◽  
Software Implementation ◽  
Quantum Structures ◽  
System Of Differential Equations ◽  
Poisson Equations ◽  
Quantum Electron ◽  
Predictor Corrector ◽  
Bound Electron

We present a fast and robust iterative method for obtaining self-consistent solutions to the coupled system of Schrödinger's and Poisson's equations in quantum structures. A simple expression describing the dependence of the quantum electron density on the electrostatic potential is used to implement a predictor – corrector type iteration scheme for the solution of the coupled system of differential equations. This approach simplifies the software implementation of the nonlinear problem, and provides excellent convergence speed and stability. We demonstrate the algorithm by presenting an example for the calculation ofthe two-dimensional bound electron states within the cross-section of a GaAs-AlGaAs based quantum wire. For this example, six times fewer iterations are needed when our predictor – corrector approach is applied, compared to a corresponding underrelaxation algorithm.

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