Nonlinear Diamagnetic Response Emerges in THz-Driven Landau Polaritons in GaAs
The study demonstrates that strong THz driving reduces the diamagnetic interaction in GaAs Landau polaritons via nonparabolic-band population, motivating a nonlinear extension of the Hopfield model. This provides a concrete path to cavity-mediated quantum optical nonlinearities at THz frequencies. Evidence rests on amplitude-dependent transmission data matched by hot-electron calculations.
Related measurements in graphene and transition-metal dichalcogenides have so far remained linear because their bands deviate less from parabolicity under comparable heating. The GaAs result therefore highlights material-specific band-structure engineering as a control knob for cavity quantum electrodynamics. Next steps include embedding the nonlinear term in a driven-dissipative master equation to predict measurable squeezing spectra and designing cavities that reach the regime where photon blockade becomes observable.
Kono group: Observation of >6 dB quadrature squeezing in the same GaAs cavity within 18 months once peak THz field exceeds 50 kV/cm.
Sources (2)
- [1]Primary Source(https://arxiv.org/abs/2608.20578)
- [2]Supporting Source(https://doi.org/10.1103/RevModPhys.93.025005)