Conference paper

Vacuum Bloch-Siegert Shift in Cyclotron Resonance

IRMMW-THz2018, International Conference on Infrared, Millimeter, and Terahertz Waves, 9-14 Sep 2018 (Nagoya Congress Center, Nagoya, Japan)

In a two-dimensional electron gas (2DEG) inside a terahertz (THz) cavity in a perpendicular magnetic field, we observed a clear resonance-frequency shift originating from the counter-rotating coupling between the electrons’ cyclotron resonance and THz cavity modes. This shift can be understood as a vacuum Bloch-Siegert shift, arising from the ultrastrong counter-rotating coupling between the cyclotron-orbiting 2DEG and the vacuum fluctuations of the THz cavity modes. While such a shift has been difficult to observe clearly and is usually neglected under the rotating-wave approximation, here an unambiguous observation was made possible by the broken time-reversal symmetry of the 2DEG in a magnetic field and the use of an ultrahigh-mobility 2DEG, a high-quality-factor cavity, and circularly polarized THz radiation.

Full text

M. Bamba, X. Li, and J. Kono
Vacuum Bloch-Siegert Shift in Cyclotron Resonance
IRMMW-THz2018, International Conference on Infrared, Millimeter, and Terahertz Waves
9-14 Sep 2018 (Nagoya Congress Center, Nagoya, Japan), Th-A2-1a-1

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