The Schrödinger equation is not relativistic
ID: the-schrodinger-equation-is-not-relativistic
Why Relativity Breaks the Schrodinger Equation by Richard Behiel (2023)
Source. Take a plane wave function, because we know its momentum perfectly. Apply a constant voltage to an electron. You can easily bring it beyond the speed of light at about 255.5 keV. New to topics? Read the docs here!