The authors report the external control of the polariton ground state by manipulating the coupling between the intersubband transition and the photonic mode of a GaAsAlGaAs microcavity. The vacuum-field Rabi splitting is varied by means of charge transfer between the energetically-aligned ground subbands of asymmetric tunnel-coupled quantum wells. The authors propose the use of this structure concept for implementing ultrafast modulation of intersubband polaritons.

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