For example , one can follow how a bound exciton is excited from its 1s ground state to a 2p state .
As discussed above , it is often meaningful to tune the electromagnetic field to be resonant with the transitions between two many - body states .
One can follow how a bound exciton is excited from its 1s ground state to a 2p state .
As discussed above , it is often meaningful to tune the electromagnetic field to be resonant with the transitions between two many - body states .