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

Experimental result and LL fanchart. (a) Current under illumination as a function of B at 80 K and at zero bias. (b) Ilight as a function of B where the decreasing background as been subtracted. (c) Fan chart of /up, 0〉 and /down, p〉 as a function of B taking into account the band non-parabolicity.
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Figure 2: Experimental result and LL fanchart. (a) Current under illumination as a function of B at 80 K and at zero bias. (b) Ilight as a function of B where the decreasing background as been subtracted. (c) Fan chart of /up, 0〉 and /down, p〉 as a function of B taking into account the band non-parabolicity.

Mentions: Experimental result is illustrated on Figure 2a. The photocurrent shows oscillations as a function of the magnetic field, superimposed on a continuous decreasing background which is removed from the experimental data in Figure 2b. Minima of current are located at B = 10.1, 11.4, 13.0, and 15.3 T and are in agreement with crossing of LL /up, 0〉 and LLs /down, p〉 represented on Figure 2c. It leads to the conclusion that an elastic scattering mechanism is dominant in this structure and mainly involves the levels /up〉 and /down〉.


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)

Experimental result and LL fanchart. (a) Current under illumination as a function of B at 80 K and at zero bias. (b) Ilight as a function of B where the decreasing background as been subtracted. (c) Fan chart of /up, 0〉 and /down, p〉 as a function of B taking into account the band non-parabolicity.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: Experimental result and LL fanchart. (a) Current under illumination as a function of B at 80 K and at zero bias. (b) Ilight as a function of B where the decreasing background as been subtracted. (c) Fan chart of /up, 0〉 and /down, p〉 as a function of B taking into account the band non-parabolicity.
Mentions: Experimental result is illustrated on Figure 2a. The photocurrent shows oscillations as a function of the magnetic field, superimposed on a continuous decreasing background which is removed from the experimental data in Figure 2b. Minima of current are located at B = 10.1, 11.4, 13.0, and 15.3 T and are in agreement with crossing of LL /up, 0〉 and LLs /down, p〉 represented on Figure 2c. It leads to the conclusion that an elastic scattering mechanism is dominant in this structure and mainly involves the levels /up〉 and /down〉.

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