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2 Opto-Electronics Review

2 2023

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Terahertz response of CdTe/Cd1-xMgxTe modulation-doped multiple quantum wells

Łusakowski Jerzy, Frączak Andrzej, Grymuza Mikołaj, Imos Eryk, Siemaszko Adam, Solarska Wiktoria, Woyciechowska Aniela, Zaremba Maciej, Zdunek Rafał, Karpierz Krzysztof, Adamus Zbigniew, Słupiński Tomasz, Wojtowicz Tomasz

Opto-Electronics Review

2023

Vol. 31, No. 2

art. no. e144600

Terahertz (THz) transmission, photoresistance, and electrical conductivity experiments were carried out at 4.2 K on a sample with modulation-doped CdTe/Cd₁₋ₓMgₓTe multiple quantum wells. The measurements were carried out as a function of a magnetic field 𝐵 up to 9 T and a radiation frequency between 0.1 and 0.66 THz. A broad minimum in the transmission curve was observed at magnetic fields corresponding to the cyclotron resonance at given THz frequency which was followed at larger fields by an oscillatory signal, periodic in 𝐵ˉ¹. Shubnikov-de Haas oscillations were observed in magnetoconductivity and in photoresistance. Each of these experimental signals revealed the same electron concentration equal to (1.01 ± 0.03) ∙10¹² cmˉ². THz spectroscopy results are compared with data obtained on a single quantum well and are discussed from the point of view of using such multiple quantum wells as THz optical elements.

Magnetospectroscopy of CdTe/Cd₁-xMgxTe modulation-doped quantum wells in THz and visible range

Łusakowski Jerzy, Zaremba Maciej, Siemaszko Adam, Karpierz Krzysztof, Adamus Zbigniew, Wojtowicz Tomasz

Opto-Electronics Review

2023

Vol. 31, No. 2

art. no. e144597

Transport, photoluminescence, THz transmission, and optically detected cyclotron resonance studies were carried out on samples with a single modulation-doped CdTe/Cd₁₋ₓMgₓTe quantum well. THz experiments were performed at liquid helium temperatures for photon energies between about 0.5 meV and 3.5 meV. An effective mass of electron was determined to be (0.1020 ± 0.0003)m₀. Observed photoluminescence and optically detected cyclotron resonance spectra cannot be explained within the simple model of Landau quantization of parabolic bands.