Evolution from 2DEG to excitonic spectra in a modulation-doped GaAs/AlGaAs single quantum well

B. M. Ashkinadze; A. Nazimov; E. Cohen; A. Ron; L. N. Pfeiffer

doi:10.1002/1521-396X(199711)164:1<523::AID-PSSA523>3.0.CO;2-0

Evolution from 2DEG to excitonic spectra in a modulation-doped GaAs/AlGaAs single quantum well

B. M. Ashkinadze, A. Nazimov, E. Cohen, A. Ron, L. N. Pfeiffer

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Abstract

The magneto-photolumineseence (PL) and its excitation (PLE) spectra are studied in a single-sided modulation-doped GaAs/AlGaAs single quantum well. With lowering the two-dimensional electron gas (2DEG) density from n_2d ≈ 1 × 10¹¹ to 1 ×¹⁰ cm^-2 by optical depletion, the 2DEG-free heavy-hole spectrum transforms into an exciton-like spectrum. Cyclotron resonance at microwave frequency is used in order to measure the 2DEG parameters in the entire range of n_2d. A narrow (0.6 to 0.8 meV) excitou-like PL line is observed when n_2d is optically decreased to ≈ 1 × 10¹⁰ cm^-2. This line shows a clear excitonic diamagnetic shift under a perpendicularly applied magnetic field (B = 0 to 4T). Under these conditions the 2DEG microwave mobility is still high (≈ 1 × 10⁶ cm²/Vs). The lowest energy PL line does not show trion features, and by this it differs from other reported cases.

Original language	English (US)
Pages (from-to)	523-526
Number of pages	4
Journal	Physica Status Solidi (A) Applied Research
Volume	164
Issue number	1
DOIs	https://doi.org/10.1002/1521-396X(199711)164:1<523::AID-PSSA523>3.0.CO;2-0
State	Published - 1997
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1002/1521-396X(199711)164:1<523::AID-PSSA523>3.0.CO;2-0

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title = "Evolution from 2DEG to excitonic spectra in a modulation-doped GaAs/AlGaAs single quantum well",

abstract = "The magneto-photolumineseence (PL) and its excitation (PLE) spectra are studied in a single-sided modulation-doped GaAs/AlGaAs single quantum well. With lowering the two-dimensional electron gas (2DEG) density from n2d ≈ 1 × 1011 to 1 ×10 cm-2 by optical depletion, the 2DEG-free heavy-hole spectrum transforms into an exciton-like spectrum. Cyclotron resonance at microwave frequency is used in order to measure the 2DEG parameters in the entire range of n2d. A narrow (0.6 to 0.8 meV) excitou-like PL line is observed when n2d is optically decreased to ≈ 1 × 1010 cm-2. This line shows a clear excitonic diamagnetic shift under a perpendicularly applied magnetic field (B = 0 to 4T). Under these conditions the 2DEG microwave mobility is still high (≈ 1 × 106 cm2/Vs). The lowest energy PL line does not show trion features, and by this it differs from other reported cases.",

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year = "1997",

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language = "English (US)",

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T1 - Evolution from 2DEG to excitonic spectra in a modulation-doped GaAs/AlGaAs single quantum well

AU - Ashkinadze, B. M.

AU - Nazimov, A.

AU - Cohen, E.

AU - Ron, A.

AU - Pfeiffer, L. N.

PY - 1997

Y1 - 1997

N2 - The magneto-photolumineseence (PL) and its excitation (PLE) spectra are studied in a single-sided modulation-doped GaAs/AlGaAs single quantum well. With lowering the two-dimensional electron gas (2DEG) density from n2d ≈ 1 × 1011 to 1 ×10 cm-2 by optical depletion, the 2DEG-free heavy-hole spectrum transforms into an exciton-like spectrum. Cyclotron resonance at microwave frequency is used in order to measure the 2DEG parameters in the entire range of n2d. A narrow (0.6 to 0.8 meV) excitou-like PL line is observed when n2d is optically decreased to ≈ 1 × 1010 cm-2. This line shows a clear excitonic diamagnetic shift under a perpendicularly applied magnetic field (B = 0 to 4T). Under these conditions the 2DEG microwave mobility is still high (≈ 1 × 106 cm2/Vs). The lowest energy PL line does not show trion features, and by this it differs from other reported cases.

AB - The magneto-photolumineseence (PL) and its excitation (PLE) spectra are studied in a single-sided modulation-doped GaAs/AlGaAs single quantum well. With lowering the two-dimensional electron gas (2DEG) density from n2d ≈ 1 × 1011 to 1 ×10 cm-2 by optical depletion, the 2DEG-free heavy-hole spectrum transforms into an exciton-like spectrum. Cyclotron resonance at microwave frequency is used in order to measure the 2DEG parameters in the entire range of n2d. A narrow (0.6 to 0.8 meV) excitou-like PL line is observed when n2d is optically decreased to ≈ 1 × 1010 cm-2. This line shows a clear excitonic diamagnetic shift under a perpendicularly applied magnetic field (B = 0 to 4T). Under these conditions the 2DEG microwave mobility is still high (≈ 1 × 106 cm2/Vs). The lowest energy PL line does not show trion features, and by this it differs from other reported cases.

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Evolution from 2DEG to excitonic spectra in a modulation-doped GaAs/AlGaAs single quantum well

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