Strong-Coupling Theory of Two-Level Atoms in Periodic Fields
Strong-Coupling Theory of Two-Level Atoms in Periodic Fields
We present a new convergent strong-coupling expansion for two-level atoms in external periodic fields, free of secular terms. As a first application, we show that the coherent destruction of tunneling is a third-order effect. We also present an exact treatment of the high-frequency region, and compare it with the theory …