 Typically, the potential is modelled as a Heaviside step function.The time-independent Schrödinger equation for the wave function formula_1 is

where "H" is the Hamiltonian, "ħ" is the reduced Planck constant, "m" is the mass, "E" the energy of the particle.The step potential is simply the product of "V"0, the height of the barrier, and the Heaviside step function