G.M. Graf, D. Hasler, J. Hoppe
No zero energy states for the supersymmetric x^2y^2 potential
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ABSTRACT. We show that the positive supersymmetric matrix-valued differential
operator H={p_x}^2 + {p_y}^2 + x^2y^2 + x\sigma_3 + y\sigma_1 has no
zero modes, i.e., H\psi = 0 implies \psi =0.