Eur. Phys. J. B 49, 213-218 (2006)
https://doi.org/10.1140/epjb/e2006-00053-9

Quantum Hall bilayer digital amplifier

¹ Physics Department, Tbilisi State University, 0128 Tbilisi,, Università di Firenze, 50139 Firenze, Italy
² Laboratoire de Physique Théorique et Astroparticules, CNRS-UMR5207, Université Montpellier 2, 34095 Montpellier, France

Corresponding author: ^a jleon@lpta.univ-montp2.fr

Received: 10 November 2005
Published online: 17 February 2006

Abstract

A quantum Hall double layer system at total Landau level filling factor ν=1, seeded by a modulated ac-voltage input signal of frequency inside the forbidden band gap, is demonstrated to work as a digital amplifier of ultra weak signals. The theory employs to the sine-Gordon model and it is confirmed by the first experimental observations of nonlinear bistable transmission in a pendula chain.