Nanowire with square cross-section: Starting with the time-independent Schrodinger equation:
(a) use separation of variables to obtain three ordinary differential equations (ODEs)
(b) solve the ODEs and obtain the solution that satisfies the boundary conditions
(c) Obtain the expression for En1n2n3
(d) How do the answers to (a) through (c) change if the nanowire has an infinite length?