2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/142129Under a perturbation by a decaying electric potential, the Landau Hamiltonian acquires some discrete eigenvalues between the Landau levels. We study the perturbation by an "expanding" electric potential $V(t^{-1}x)$, $t>0$, and derive a quasi-classical formula for the counting function of the discrete spectrum as $t\to \infty$.22 pages, AMSLaTEXSpectral TheoryMathematical Physics47F05, 35P20, 58J37text