scholarly journals Soft sphere model for electron correlation and scattering in the atomistic modelling of semiconductor devices

2002 ◽  
Author(s):  
J.R. Watling ◽  
J.R. Barker ◽  
A. Asenov
Keyword(s):  
Electron Correlation ◽  
Semiconductor Devices ◽  
Sphere Model ◽  
Soft Sphere ◽  
Atomistic Modelling

scholarly journals Soft Sphere Model for Electron Correlation and Scattering in the Atomistic Modelling of Semiconductor Devices

VLSI Design ◽  
2001 ◽  
Vol 13 (1-4) ◽  
pp. 441-446
Author(s):  
J. R. Watling ◽  
J. R. Barker ◽  
A. Asenov
Keyword(s):  
Charge Distribution ◽  
Coulomb Interaction ◽  
Electron Correlation ◽  
Impurity Scattering ◽  
Spatial Distributions ◽  
Sphere Model ◽  
Soft Sphere ◽  
Carrier Scattering ◽  
Atomistic Modelling ◽  
Large Ensembles

As MOSFET devices within the deep sub-micron regime are modelled, it is no longer feasible to represent the charged dopants by a continuous charge distribution. In this regime an ensemble of devices, each with different spatial distributions and the number of dopants, must be modelled. However, it is computationally prohibitive to solve for the full Coulomb interaction required for particle simulators, especially for an ensemble of devices. To address this point, the paper focuses on the issue of modelling the dynamics in the presence of discrete carrier–carrier scattering and carrier-fixed impurity scattering which is suitable for efficient simulations of large ensembles of devices.

Virial coefficients, equation of state, and solid–fluid coexistence for the soft sphere model

2011 ◽  
Vol 109 (1) ◽  
pp. 123-132 ◽  
Author(s):  
Tai Boon Tan ◽  
Andrew J. Schultz ◽  
David A. Kofke
Keyword(s):  
Equation Of State ◽  
Virial Coefficients ◽  
Sphere Model ◽  
Soft Sphere

scholarly journals Direct numerical simulation of pattern formation in subaqueous sediment

2014 ◽  
Vol 750 ◽  
Author(s):  
Aman G. Kidanemariam ◽  
Markus Uhlmann
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Propagation Speed ◽  
Immersed Boundary ◽  
Flow Conditions ◽  
Sphere Model ◽  
Soft Sphere ◽  
Sediment Bed ◽  
Fluid Bed ◽  
Two Parameter

AbstractWe present results of direct numerical simulation of incompressible fluid flow over a thick bed of mobile spherically shaped particles. The algorithm is based upon the immersed-boundary technique for fluid–solid coupling and uses a soft-sphere model for the solid–solid contact. Two parameter points in the laminar flow regime are chosen, leading to the emergence of sediment patterns classified as ‘small dunes’, while one case under turbulent flow conditions leads to ‘vortex dunes’ with significant flow separation on the lee side. The wavelength, amplitude and propagation speed of the patterns extracted from the spanwise-averaged fluid–bed interface are found to be consistent with available experimental data. The particle transport rates are well represented by available empirical models for flow over a plane sediment bed in both the laminar and the turbulent regimes.

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