Weighted dispersive estimates for two-dimensional Schrödinger operators with Aharonov-Bohm magnetic field

We consider two-dimensional Schrödinger operators $H$ with Aharonov-Bohm magnetic field and an additional electric potential. We obtain an explicit leading term of the asymptotic expansion of the unitary group $e^{-i t H}$ for $t\to\infty$ in weighted $L^2$ spaces. In particular, we show that the magnetic field improves the decay of $e^{-i t H}$ with respect to the unitary group generated by non-magnetic Schrödinger operators, and that the decay rate in time is determined by the magnetic flux.

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