Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 61: Focus Session: Tailored Nonlinear Photonics I
HL 61.2: Invited Talk
Thursday, March 19, 2020, 10:00–10:30, POT 51
Quasi-instantaneous switch-off of deep-strong light-matter coupling — •Christoph Lange1, Maike Halbhuber1, Joshua Mornhinweg1, Viola Zeller1, Cristiano Ciuti2, Dominique Bougeard1, and Rupert Huber1 — 1University of Regensburg, Germany — 2Université de Paris, France
Optical microresonators facilitate custom-tailored quantum states of matter by dressing electronic excitations with virtual cavity photons. Once the rate of energy exchange between light and matter modes exceeds the carrier frequency of light itself, 'deep-strong coupling' emerges, and the vacuum ground state is profoundly modified, giving rise to novel phenomena including cavity-mediated superconductivity and other phase transitions. While the exploration of the equilibrium properties of deep-strong coupling has just started, yet more unusual quantum dynamics are expected on subcycle scales. Here, we explore the intriguing dynamics that arises when deep-strong light-matter coupling is switched off quasi-instantly. The experiments employ custom-tailored THz nanoresonators coupled to cyclotron resonances of two-dimensional electron gases. Femtosecond photoexcitation of an integrated switch element extinguishes the fundamental cavity mode and decouples it from the cyclotron resonance, more than an order of magnitude faster than the oscillation cycle of light. The quasi-instantaneous extinction of the polariton states is hallmarked by sub-polariton-cycle oscillations of the transmission as confirmed by a quantum model.