## Charge transport in semiconductors with degeneracy effects.(English)Zbl 0733.76062

This paper is concerned with the following Boltzmann equation, arising in the kinetic theory of semiconductors: $\partial_ tf+\nu \cdot \nabla_ xf-(q/m)E\cdot \nabla_{\nu}f=Q(f).$ Here x and $$\nu$$ are the space and velocity variables, both in $${\mathbb{R}}^ 3$$, q the charge and m the effective mass of an electron, $$E=E(t,x)$$ the electric field. Q (the collision operator) is a nonlinear integral operator, vanishing at $$f=[1+\exp ((m\nu^ 2/2-\mu)/kT)]^{-1}$$, where k is the Boltzmann constant, T a temperature, $$\mu =\mu (t,x)$$ is called the Fermi energy.
After a scaling this equation assumes the following dimensionless form: $$\alpha^ 2\partial_ tf+\alpha (\nu \cdot \nabla_ xf-E\cdot \nabla_{\nu}f)=Q(f),$$ where the same symbols for scaled and unscaled quantities are used; $$\alpha$$ (the scaled mean free path) is a parameter. It is shown by a contraction argument that the Cauchy problem for this equation has an unique weak solution for suitable integrable Cauchy data and smooth electric fields. Moreover, for $$\alpha\to 0$$, the solutions of the scaled equations converge in $$L^ p_{loc}$$ to a Fermi-Dirac function $$F(\mu,\nu)=[1+\exp (\nu^ 2/2-\mu)]^{-1},$$ where $$\mu$$ is a weak solution of a conservation law, called fluid equation. The derivation of this equation is one of the aims of the paper. A study of (a rescaled version of) the fluid equation is also given.
Reviewer: A.Corli (Ferrara)

### MSC:

 76P05 Rarefied gas flows, Boltzmann equation in fluid mechanics 82C70 Transport processes in time-dependent statistical mechanics 35D05 Existence of generalized solutions of PDE (MSC2000)
Full Text:

### References:

 [1] Bardos, Ann. Inst. Henri Poincaré-Anal. non linéaire 2 pp 101– (1985) [2] Bardos, Trans. AMS 284 pp 617– (1984) [3] Semiconductor Statistics, Pergamon Press, Oxford 1962. · Zbl 0151.44803 [4] DiPerna, Common. on Pure and Appl. Math. XVII pp 729– (1989) [5] Golse, J. Funct. Anal. 88 pp 110– (1988) [6] and , Fluid limit of the Vlasov-Poisson-Boltzmann equation of semiconductors, Proc. BAIL V Conf., Boole Press, Dublin 1988. · Zbl 0678.76081 [7] Hilbert, Math. Ann. 72 pp 562– (1912) [8] and , Linear and Quasilinear Equations, of Parabolic Type, AMS Transl., Vol. 23, Providence, Rhode Island, 1968. [9] and , Linear and Quasilinear Elliptic Equations, Academic Press, New York 1968. [10] Larsen, J. Math. Phys. 15 pp 75– (1974) [11] and , Semiconductor Equations, Springer, Vienna. 1990. · doi:10.1007/978-3-7091-6961-2 [12] Global existence of solutions for a system of nonlinear Boltzmann equations of semiconductor Physics, Preprint C.M.A. Ecole Polytechnique, Paris, 1990. [13] Proc. NASECODE IV, V Conf., Boole Press, Dublin, 1985, p. 87. [14] ’Diffusion approximation and Milne problem for a Boltzmann equation of semiconductors’, Internal Report No. 150, C.M.A. Ecole Polytechnique, Paris, 1986. [15] Poupaud, C. R. Acad. Sci. Paris 308 pp 381– (1989) [16] Poupaud, SIAM J Appl. Math. 50 pp 1593– (1990) [17] ’Low-field electron transport’, in Semiconductors and Semimetals, Vol. 10, Academic Press, New York, 1975.
This reference list is based on information provided by the publisher or from digital mathematics libraries. Its items are heuristically matched to zbMATH identifiers and may contain data conversion errors. In some cases that data have been complemented/enhanced by data from zbMATH Open. This attempts to reflect the references listed in the original paper as accurately as possible without claiming completeness or a perfect matching.