Adiabaticity parameters for the categorization of light-matter interaction: From weak to strong driving

We investigate theoretically and numerically the light-matter interaction in a two-level system (TLS) as model for excitation solid-state band structure. identify five clearly distinct regimes, categorized with well-known adiabaticity parameters: (1) perturbative multiphoton absorption regime small driving field strengths, four light field-driven where intraband motion connects different TLS: (2) impulsive Landau-Zener (LZ) regime, (3) non-impulsive LZ (4) adiabatic (5) adiabatic-impulsive large electric strengths. This categorization is tremendously helpful to understand highly complex dynamics any TLS, particular when strength varies, naturally Rabi physics physics. In addition, we find an insightful analytical expression photon orders connecting regimes. Moreover, transitions are equally important, leading inversion symmetry breaking of TLS applying few-cycle laser pulses. allows deep understanding driven variety settings ranging from cold atoms molecules solids qubits, will help optimal parameters given purpose.