On spectral properties of translationally invariant magnetic Schrödinger operators

Abstract

We consider a class of translationally invariant magnetic fields such that the corresponding potential has a constant direction. Our goal is to study basic spectral properties of the Schrödinger operator $\mathbf{H}$ with such a potential. In particular, we show that the spectrum of $\mathbf{H}$ is absolutely continuous and we find its location. Then we study the long-time behaviour of solutions $\exp (-i\mathbf{H}t)f$ of the time dependent Schrödinger equation. It turnes out that a quantum particle remains localized in the plane orthogonal to the direction of the potential. Its propagation in this direction is determined by group velocities. It is to a some extent similar to a evolution of a one-dimensional free particle but "exits" to $+\infty$ and $-\infty$ might be essentially different.

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