Limits...
Magnetotransport in quantum cascade detectors: analyzing the current under illumination.

Jasnot FR, Péré-Laperne N, de Vaulchier LA, Guldner Y, Carosella F, Ferreira R, Buffaz A, Doyennette L, Berger V, Carras M, Marcadet X - Nanoscale Res Lett (2011)

Bottom Line: 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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratoire Pierre Aigrain, Ecole Normale Supérieure CNRS (UMR 8551), 24 rue Lhomond, 75231 Paris Cedex 05, France. louis-anne.devaulchier@lpa.ens.fr.

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.

No MeSH data available.


Related in: MedlinePlus

Conduction band diagram of one period of an 8 μm QCD showing the energy levels. Note that the ground state of the first QW belongs to the former period and is noted /down〉. The arrows illustrate the electronic path during a detection event. The layer sequence is as follows 67.8/56.5/19.8/39.6/22.6/31.1/28.3/31.1 /33.9/31.1/39.6/31.1/45.2/50.8 (the barriers are represented in bold types). The n-doping of the large QW is 5 × 1011 cm-2.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211262&req=5

Figure 1: Conduction band diagram of one period of an 8 μm QCD showing the energy levels. Note that the ground state of the first QW belongs to the former period and is noted /down〉. The arrows illustrate the electronic path during a detection event. The layer sequence is as follows 67.8/56.5/19.8/39.6/22.6/31.1/28.3/31.1 /33.9/31.1/39.6/31.1/45.2/50.8 (the barriers are represented in bold types). The n-doping of the large QW is 5 × 1011 cm-2.

Mentions: The QCD under study is a GaAs/Al0.34Ga0.66As heterostructure with a detection wavelength of 8 μm as described in ref. [9]. It consists of 40 identical periods of 7 coupled GaAs quantum wells. Figure 1 recalls the principle of the device.


Magnetotransport in quantum cascade detectors: analyzing the current under illumination.

Jasnot FR, Péré-Laperne N, de Vaulchier LA, Guldner Y, Carosella F, Ferreira R, Buffaz A, Doyennette L, Berger V, Carras M, Marcadet X - Nanoscale Res Lett (2011)

Conduction band diagram of one period of an 8 μm QCD showing the energy levels. Note that the ground state of the first QW belongs to the former period and is noted /down〉. The arrows illustrate the electronic path during a detection event. The layer sequence is as follows 67.8/56.5/19.8/39.6/22.6/31.1/28.3/31.1 /33.9/31.1/39.6/31.1/45.2/50.8 (the barriers are represented in bold types). The n-doping of the large QW is 5 × 1011 cm-2.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211262&req=5

Figure 1: Conduction band diagram of one period of an 8 μm QCD showing the energy levels. Note that the ground state of the first QW belongs to the former period and is noted /down〉. The arrows illustrate the electronic path during a detection event. The layer sequence is as follows 67.8/56.5/19.8/39.6/22.6/31.1/28.3/31.1 /33.9/31.1/39.6/31.1/45.2/50.8 (the barriers are represented in bold types). The n-doping of the large QW is 5 × 1011 cm-2.
Mentions: The QCD under study is a GaAs/Al0.34Ga0.66As heterostructure with a detection wavelength of 8 μm as described in ref. [9]. It consists of 40 identical periods of 7 coupled GaAs quantum wells. Figure 1 recalls the principle of the device.

Bottom Line: 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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratoire Pierre Aigrain, Ecole Normale Supérieure CNRS (UMR 8551), 24 rue Lhomond, 75231 Paris Cedex 05, France. louis-anne.devaulchier@lpa.ens.fr.

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.

No MeSH data available.


Related in: MedlinePlus