Solid-State Cavity QED with Cooperative Ultrastrong Coupling

22/06/2018 @ 11:00 AM – 12:00 PM Asia/Singapore Timezone

Speaker: Professor Junichiro Kono
Affiliation: Departments of Electrical & Computer Engineering, Physics & Astronomy, and Materials Science & NanoEngineering, Rice University
Host: Professor Eda Goki
Location: Click HERE for directions

Abstract Details: Strong resonant light-matter coupling in a cavity setting is an essential ingredient in cavity-QED-based quantum information processing as well as explorations of new ground states in strongly light-driven condensed matter. This talk will first describe our recent observation of cooperative ultrastrong light-matter coupling in a two-dimensional electron gas in a high-Q terahertz cavity in a quantizing magnetic field, demonstrating a record-high cooperativity [1]. The electron cyclotron resonance peak exhibited splitting into the lower and upper polariton branches with a magnitude that is proportional to the square-root of the electron density, a hallmark of cooperative vacuum Rabi splitting. Additionally, we have obtained clear and definitive evidence for the vacuum Bloch-Siegert shift due to the breakdown of the rotating-wave approximation [2]. The second part of this talk will present one-dimensional microcavity exciton polaritons in a thin film of aligned carbon nanotubes [3] embedded in a Fabry-Perot cavity, also exhibiting cooperative ultrastrong light-matter coupling with unusual continuous controllability over the coupling strength through polarization rotation [4]. These experiments open up a variety of new possibilities to combine the traditional disciplines of many-body condensed matter physics and cavity-based quantum optics.

1. Q. Zhang et al., Nature Physics 12, 1005 (2016).
2. X. Li et al., Nature Photonics 12, 324 (2018)
3. X. He et al., Nature Nanotechnology 11, 633 (2016).
4. W. Gao et al., Nature Photonics 12, 362 (2018).

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