Aluminum gallium arsenide AlxGa1-xAs) is a semiconductor material having almost the same lattice constant as gallium arsenide but a bigger bandgap. The x in the formula is a number between 0 and 1 ...

if we make the association where a is the lattice constant. From the analytic arguments in equations (2) to (4), we therefore see that the modulation phase in the time-dependent Hamiltonian in ...