A THz quantum cascade detector in a strong perpendicular magnetic field

Scalari, Giacomo; Graf, Marcel; Hofstetter, Daniel; Faist, Jérôme; Beere, Harvey E.; Ritchie, D. A.

doi:10.1088/0268-1242/21/12/042

Cited by 16 publications

(14 citation statements)

References 23 publications

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“…The quantum cascade detector, 1 (QCD) recently proposed and realized in both the mid-infrared 2 and in the THz 3,4 range, is a photovoltaic version of the quantum well infrared photodetector (QWIP). 5 The band structure of these devices is designed as a quantum cascade laser (QCL) under no applied electric field.…”

Section: Introductionmentioning

confidence: 99%

“…This experimental technique has been used to evaluate the different contributions of various scattering mechanisms in complex quantum cascade structures. 4,[9][10][11][12] The aim of the current magnetophotocurrent study is to understand electronic transport in QCDs under illumination and to study the scattering mechanisms involved in these complex structures at their working temperature (80 K). We further develop a simple model of transport under illumination in a QCD as well as calculations of rates for various electron scattering mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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Photocurrent analysis of quantum cascade detectors by magnetotransport

Jasnot¹,

Péré‐Laperne²,

Vaulchier³

et al. 2010

Phys. Rev. B

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Photocurrent measurements have been performed on a quantum cascade detector structure under strong magnetic field B applied parallel to the growth axis. The photocurrent shows oscillations as a function of B. In order to describe this 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 these structures. We present a calculation of the 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 identify key parameters to optimize them further.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocurrent analysis of quantum cascade detectors by magnetotransport

Jasnot¹,

Péré‐Laperne²,

Vaulchier³

et al. 2010

Phys. Rev. B

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show abstract

“…The Quantum Cascade Detector (QCD) [1][2][3][4] recently proposed and realized as a photovoltaic version of Quantum Well Infrared Photodetectors (QWIPs) 5 , is a typical example of such a mesoscopic and complex structure. A period contains an "active region" dedicated to the absorption of infrared photons from the ground level to the upper levels of the structure (E 1 ′ to E 7 and E 8 as shown in figure 1).…”

Section: Introductionmentioning

confidence: 99%

Dark current analysis of quantum cascade detectors by magnetoresistance measurements

et al. 2008

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Magneto-transport experiments have been performed on Quantum Cascade Detectors. These experiments lead to the identification of the different electronic transitions from subbands in one cascade period to subbands in the following one. These transitions contribute to the total current flowing through the structure in the absence of illumination. This dark current is well described within a simple model based on the sum of diffusion events from one cascade to the next one through optical phonon mediated transitions. For the first time, the optical and electronic properties of such a complex heterostructure can be fully predicted without any other adjustable parameter than the doping density. This opens the way to a full quantum design of an infrared detector, in contrast with the phenomenological optimization of structures usually performed in this field.

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“…These applications will ultimately require the availability of higher optical power THz sources, but also compact and low-noise THz semiconductor detectors. As a result, the research in THz sensing has drawn increasing interest, and has already led to the demonstration of a series of promising heterostructure schemes that encompass the quantum cascade detector [6], quantum well IR photodetector [7], heterojunction interfacial work function internal photoemission detector [8] and tunnel quantum dot intersublevel photodetector [9]. These devices are based either on intersublevel absorption or bulk free carrier absorption.…”

Section: Introductionmentioning

confidence: 99%