 11124 Pavel Exner and Diana Barseghyan
 Spectral estimates for a class of Schr\"odinger operators with infinite phase space and potential unbounded from below
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Sep 1, 11

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Abstract. We analyze twodimensional Schr\"odinger operators with the potential $xy^p  \lambda (x^2+y^2)^{p/(p+2)}$ where $p\ge 1$ and $\lambda\ge 0$. We show that there is a critical value of $\lambda$ such that the spectrum for $\lambda<\lambda_\mathrm{crit}$ is below bounded and purely discrete, while for $\lambda>\lambda_\mathrm{crit}$ it is unbounded from below. In the subcritical case we prove upper and lower bounds for the eigenvalue sums.
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