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In this work we investigate a low dimensional semiconductor system, in whichthe light-matter interaction is enhanced by the cooperative behavior of a largenumber of dipolar oscillators, at different frequencies, mutually phase lockedby Coulomb interaction. We experimentally and theoretically demonstrate that,owing to this phenomenon, the optical response of a semiconductor quantum wellwith several occupied subbands is a single sharp resonance, associated to theexcitation of a bright multisubband plasmon. This effect illustrates how thewhole oscillator strength of a two-dimensional system can be concentrated intoa single resonance independently from the shape of the confining potential.When this cooperative excitation is tuned in resonance with a cavity mode,their coupling strength can be increased monotonically with the electronicdensity, allowing the achievement of the ultra-strong coupling regime up toroom temperature.

Charge induced coherence between intersubband plasmons in a quantum structure