Details

Autor(en) / Beteiligte

• Suresh, Vishnunarayanan
• Pinsolle, Edouard
• Lupien, Christian
• Martz-Oberlander, Talia J.
• Lilly, Michael P.
• Reno, John L.
• Gervais, Guillaume
• Szkopek, Thomas
• Reulet, Bertrand

Titel

Quantitative measurement of giant and quantized microwave Faraday rotation

Ist Teil von

• Physical review. B, 2020-08, Vol.102 (8), p.1, Article 085302

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2020

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• We report quantitative microwave Faraday rotation measurements conducted with a high-mobility two-dimensional electron gas (2DEG) in a GaAs/AlGaAs semiconductor heterostructure. In a magnetic field, the Hall effect and the Faraday effect arise from the action of Lorentz force on electrons in the 2DEG. As with the Hall effect, a classical Faraday effect is observed at low magnetic field along with a quantized Faraday effect at high magnetic field. The high electron mobility of the 2DEG enables a giant single-pass Faraday rotation of θmaxF ≃ 45 ∘ ( ≃ 0.8 rad) to be achieved at a modest magnetic field of B ≃ 100 mT. In the quantum regime, we find that the Faraday rotation θF is quantized in units of α∗ = 2.80 ( 4 ) α, where α ≃ 1 / 137 is the fine-structure constant. The enhancement in rotation quantum α∗ > α is attributed to electromagnetic confinement within a waveguide structure.