Open Access Nano Express

Magnetotransport in quantum cascade detectors: analyzing the current under illumination

François-Régis Jasnot1, Nicolas Péré-Laperne1, Louis-Anne de Vaulchier1*, Yves Guldner1, Francesca Carosella1, Robson Ferreira1, Amandine Buffaz2, Laetitia Doyennette2, Vincent Berger2, Mathieu Carras3 and Xavier Marcadet3

Author Affiliations

1 Laboratoire Pierre Aigrain, Ecole Normale Supérieure CNRS (UMR 8551), 24 rue Lhomond, 75231 Paris Cedex 05, France

2 Laboratoire Matériaux et Phénomènes Quantiques, Université Denis Diderot - Paris 7, CNRS (UMR 7162), Bâtiment Condorcet, 75205 Paris Cedex 13, France

3 Alcatel-Thales 3-5 lab, Route départementale 128, 91767 Palaiseau Cedex, France

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Nanoscale Research Letters 2011, 6:206  doi:10.1186/1556-276X-6-206

Published: 9 March 2011

Abstract

Photocurrent measurements have been performed on a quantum cascade detector structure under strong magnetic field applied parallel to the growth axis. The photocurrent shows oscillations as a function of B. In order to describe that behavior, we have developed a rate equation model. The interpretation of the experimental data supports the idea that an elastic scattering contribution plays a central role in the behavior of those structures. We present a calculation of electron lifetime versus magnetic field which suggests that impurities scattering in the active region is the limiting factor. These experiments lead to a better understanding of these complex structures and give key parameters to optimize them further.