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Vacuum Bloch-Siegert Shift in Cyclotron Resonance

13th September 2018 @ 11:00 AM - 11:30 AM

IRMMW-THz2018, International Conference on Submillimeter Waves and their Applications, today’s International Conference on Infrared, Millimeter, and Terahertz Waves

11:00 – 12:30 Th-A2-1a Spectroscopy and Material Properties VIII

Motoaki Bamba, Xinwei Li, and Junichiro Kono
In a two-dimensional electron gas (2DEG) in GaAs quantum wells placed inside a terahertz (THz) cavity in the presence of an external 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 a high-mobility 2DEG, a high-quality-factor cavity, and circularly polarized THz radiation.


13th September 2018
11:00 AM - 11:30 AM
Event Category:


Nagoya Congress Center
1-1 Atsuta-nishimachi, Atsuta-ku
Nagoya, Aichi 456-0036 Japan
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IRMMW-THz 2018