 98503 Helffer B., HoffmannOstenhof M., HoffmannOstenhof T., Owen M. P.
 Nodal sets for the groundstate of the Schroedinger operator
with zero magnetic field in a non simply connected domain.
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Jul 13, 98

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Abstract. We investigate nodal sets of magnetic Schroedinger operators
with zero magnetic field, acting on a non simply connected domain in $\r^2$.
For the case of circulation $1/2$ of the magnetic vector potential around
each hole in the region, we obtain a characterisation of the nodal set, and
use this to obtain bounds on the multiplicity of the groundstate. For the
case of one hole and a fixed electric potential, we show that the first
eigenvalue takes its highest value for circulation $1/2$.
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