Universidad Complutense de Madrid
E-Prints Complutense

Self-sustained current oscillations in the kinetic theory of semiconductor superlattices

Impacto

Downloads

Downloads per month over past year

Cebrián, E. and Bonilla, L.L- and Carpio, Ana (2009) Self-sustained current oscillations in the kinetic theory of semiconductor superlattices. Journal of Computational Physics, 228 (20). pp. 7869-7705. ISSN 0021-9991

[img] PDF
Restringido a Repository staff only

4MB
[img]
Preview
PDF
1MB

Official URL: http://www.sciencedirect.com/science/article/pii/S002199910900388X


URLURL Type
http://arxiv.org/pdf/0907.3807.pdfOrganisation


Abstract

We present the first numerical solutions of a kinetic theory description of self-sustained current oscillations in n-doped semiconductor superlattices. The governing equation is a single-miniband Boltzmann-Poisson transport equation with a BGK (Bhatnagar-Gross-Krook) collision term. Appropriate boundary conditions for the distribution function describe electron injection in the contact regions. These conditions seamlessly become Ohm's law at the injecting contact and the zero charge boundary condition at the receiving contact when integrated over the wave vector. The time-dependent model is numerically solved for the distribution function by using the deterministic Weighted Particle Method. Numerical simulations are used to ascertain the convergence of the method. The numerical results confirm the validity of the Chapman-Enskog perturbation method used previously to derive generalized drift-diffusion equations for high electric fields because they agree very well with numerical solutions thereof.


Item Type:Article
Uncontrolled Keywords:Semiconductor superlattice Boltzmann–BGK–Poisson kinetic equation Contact boundary conditions Self-sustained current oscillations Particle methods
Subjects:Sciences > Physics > Solid state physics
Sciences > Physics > Hydrodynamics
ID Code:14904
Deposited On:19 Apr 2012 09:24
Last Modified:12 Dec 2018 15:07

Origin of downloads

Repository Staff Only: item control page