Journal ArticleDOI
Homogenization of the Schrödinger Equation and Effective Mass Theorems
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In this paper, the authors derived effective mass theorems in solid state physics for a Schrodinger equation with a large periodic potential, denoting by ∈ the period, the potential is scaled as ∈−2.Abstract:
We study the homogenization of a Schrodinger equation with a large periodic potential: denoting by ∈ the period, the potential is scaled as ∈−2. We obtain a rigorous derivation of so-called effective mass theorems in solid state physics. More precisely, for well-prepared initial data concentrating on a Bloch eigenfunction we prove that the solution is approximately the product of a fast oscillating Bloch eigenfunction and of a slowly varying solution of an homogenized Schrodinger equation. The homogenized coefficients depend on the chosen Bloch eigenvalue, and the homogenized solution may experience a large drift. The homogenized limit may be a system of equations having dimension equal to the multiplicity of the Bloch eigenvalue. Our method is based on a combination of classical homogenization techniques (two-scale convergence and suitable oscillating test functions) and of Bloch waves decomposition.read more
Citations
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Wave packets in Honeycomb Structures and Two-Dimensional Dirac Equations
TL;DR: In this article, the authors studied the time evolution of wave-packets, which are spectrally concentrated near conical points, and proved that the large, but finite, time dynamics is governed by the two-dimensional Dirac equations.
Journal ArticleDOI
Wave Packets in Honeycomb Structures and Two-Dimensional Dirac Equations
TL;DR: In this paper, the authors studied the time-evolution of wave-packets, which are spectrally concentrated near conical points in the Brillouin zone, and proved that the large but finite, time dynamics is governed by the Dirac equations.
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Defect Modes and Homogenization of Periodic Schrödinger Operators
Mark Hoefer,Michael I. Weinstein +1 more
TL;DR: In this article, the authors consider the discrete eigenvalues of the Schrodinger operator He = − Δ+ V (x )+ e2Q(ex), where V(x) is periodic and Q(y) is localized on R d, d ≥ 1.
Journal ArticleDOI
Homogenisation for elastic photonic crystals and dynamic anisotropy
TL;DR: In this paper, a model for wave propagation through elastic media that contain periodic, or nearly periodic, arrangements of traction free, or clamped, inclusions has been developed, valid at high frequencies.
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Homogenization of Periodic Systems with Large Potentials
TL;DR: In this article, the authors consider the homogenization of a system of second-order equations with a large potential in a periodic medium and prove that the solution can be approximately factorized as the product of a fast oscillating cell eigenfunction and of a slowly varying solution of a scalar second-Order equation.
References
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Book
Introduction to solid state physics
TL;DR: In this paper, the Hartree-Fock Approximation of many-body techniques and the Electron Gas Polarons and Electron-phonon Interaction are discussed.
Book
Perturbation theory for linear operators
TL;DR: The monograph by T Kato as discussed by the authors is an excellent reference work in the theory of linear operators in Banach and Hilbert spaces and is a thoroughly worthwhile reference work both for graduate students in functional analysis as well as for researchers in perturbation, spectral, and scattering theory.