Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Magnetotransport in quantum cascade detectors: analyzing the current under illumination | Jasnot et al. Nanoscale Research Letters 2011 6 206 http content 6 1 206 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Magnetotransport in quantum cascade detectors analyzing the current under illumination 1 1 1 1 1 Frangois-Regis Jasnot Nicolas Péré-Laperne Louis-Anne de Vaulchier Yves Guldner Francesca Carosella Robson Ferreira1 Amandine Buffaz2 Laetitia Doyennette2 Vincent Berger2 Mathieu Carras3 Xavier Marcadet3 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. Introduction The quantum cascade detector QCD 1 recently proposed and realized in both the mid-infrared 2 and the THz 3 4 range is a photovoltaic version of the quantum well infrared photodetector 5 . Their band structure are designed as quantum cascade lasers without any applied bias voltage 1 3 . QCD are totally passive systems and show a response only to photon excitation. As such the QCD structure is designed to generate an electronic displacement under illumination through a cascade of quantum levels without the need of an applied bias voltage. In a semiconductor quantum well structure magnetic field applied along the growth direction breaks the 2D in-plane continuum into discrete Landau levels LLs . This experimental technique has been used to evaluate the different .
