Anomalous quantum Hall conductivity and resonances in coupled layers
Department of Physics and Astronomy and Condensed Matter
and Surface Sciences Program, Ohio University, Athens - OH 45701-2979, USA
Accepted: 29 November 1999
A two-layer system coupled via tunneling and with different carrier masses in each layer is investigated in the integer quantum Hall regime. Striking deviations of the one-layer Hall conductivity from the usual quantization are found, if resonance between Landau levels of different layers is achieved. The appearance of negative jumps in the Hall conductivity is also predicted under suitable conditions. The results obtained are robust against moderate disorder in the system.
PACS: 73.23.-b – Mesoscopic systems / 73.40.Hm – Quantum Hall effect (integer and functional)
© EDP Sciences, 2000