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Intense multi-THz pulses are used to study the coherent nonlinear response ofbulk InSb by means of field-resolved four-wave mixing spectroscopy. Atamplitudes above 5 MV/cm the signals show a clear temporal substructure whichis unexpected in perturbative nonlinear optics. Simulations based on atwo-level quantum system demonstrate that in spite of the strongly off-resonantcharacter of the excitation the high-field pulses drive the interbandresonances into a non-perturbative regime of Rabi flopping.

Non-perturbative Interband Response of InSb Driven Off-resonantly by Few-cycle Electromagnetic Transients