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Magnetoplasmons in a High Electron Mobility GaAs/AlGaAs Heterostructure

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Białek M., Karpierz K., Piętka B., Grynberg M., Łusakowski J., Czapkiewicz M., Fronc K., Wróbel J., Umansky V.

Acta Physica Polonica A

2012

vol. 122

issue 6

1096-1098

We have observed a multimode spectrum of magnetoplasmons in the Hall bars processed on a high electron mobility GaAs/AlGaAs heterostructure. We have found that the dispersion relation of these excitation follows square root dependence. Calculated wavelength of the fundamental magnetoplasmon mode fits to the width of sample.

Terahertz Response of a Point Contact Based on CdTe/CdMgTe Quantum Well in Magnetic Field

81%

Grigelionis I., Białek M., Grynberg M., Czapkiewicz M., Kolkovskiy V., Wiater M., Wojciechowski T., Wróbel J., Wojtowicz T., But D., Knap W., Łusakowski J.

Acta Physica Polonica A

2012

vol. 122

issue 6

1069-1072

A photoresponse at THz frequencies of a quantum point contact fabricated on a CdTe/CdMgTe quantum well was studied at low temperatures as a function of magnetic field. The spectra show a structure which was interpreted as resulting from the cyclotron resonance and magnetoplasmon excitations. The wavelength of the fundamental magnetoplasmon mode was found to be about 2 μm which coincides with one of dimensions of the point contact. We also discuss the possibility of coupling of magnetoplasmon modes to shallow impurity transitions in the quantum well.

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2 Acta Physica Polonica A

2 2012

2 Białek M.

2 Czapkiewicz M.

2 Grynberg M.

2 Wróbel J.

2 Łusakowski J.

1 But D.

1 Fronc K.

1 Grigelionis I.

1 Karpierz K.

1 Knap W.

1 Kolkovskiy V.

1 Piętka B.

1 Umansky V.

1 Wiater M.

1 Wojciechowski T.

1 Wojtowicz T.

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Magnetoplasmons in a High Electron Mobility GaAs/AlGaAs Heterostructure

Terahertz Response of a Point Contact Based on CdTe/CdMgTe Quantum Well in Magnetic Field