An unperturbed two-level system has energy eigenvalues E1 and E2, and eigenfunctions ?1 = (1, 0)

Question

Cyra Jelle Calleja · Accepted Answer

Step 1: Identify the given information. The unperturbed two-level system has energy eigenvalues

An unperturbed two-level system has energy eigenvalues E1 and E2, and eigenfunctions ?1 = (1, 0)T and ?2 = (0, 1)T. When perturbed, its Hamiltonian is represented by (E1 A; A* E2). The second-order correction to E1 is a. A^2 / (E1 - E2) b. A c. A^2 / (E2 - E1) d. 0