x\frac{\partial}{\partial y}-y\frac{\partial}{\partial x}
\right)+\frac{e^2B^2}{8m}(x^2+y^2)
$\\
$
L_z=x\frac{\partial}{\partial y}-y\frac{\partial}{\partial x}
x\frac{\partial}{\partial y}-y\frac{\partial}{\partial x}
\right)+\frac{e^2B^2}{8m}(x^2+y^2)
$\\
$
L_z=x\frac{\partial}{\partial y}-y\frac{\partial}{\partial x}