The expectation value of the derivative of this parameter appears on one side of the Hellman-Feynman theorem.
The expectation value of the derivative of this parameter appears on one side of the Hellman-Feynman theorem. In a periodic system, this operator commutes with the translation operator, leading to Bloch's theorem. The exponential of negative I times t times this parameter over h-bar gives the (*) time evolution operator. Eigenstates of this operator do not change under a slow perturbation according to the adiabatic theorem. This operator of the wavefunction is equal to i h-bar times the time derivative of the wavefunction according to the time-independent Schrodinger equation. For 10 points, name this operator that returns the total energy of the system.
The expectation value of the derivative of this parameter appears on one side of the Hellman-Feynman theorem.
Hamiltonian