Photoluminescence study of magnetic-field-induced excitonic transitions in Alx Ga1-x As GaAs asymmetric double quantum wells

Kyu Seok Lee, Sam Kyu Noh, Soo Kyung Chang

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6 Citations (Scopus)

Abstract

We have observed magnetic-field-induced charged excitonic transitions from one-side-modulation-doped Alx Ga1-x As GaAs asymmetric double quantum wells (ADQWs) where two low-energy conduction subbands e1 and e2 are coupled strongly, whereas the heavy-hole ground state hh1 is localized mostly in a quantum well. In the presence of a magnetic field applied parallel to the growth axis, the photoluminescence spectrum of the e1-hh1 transition develops into a Landau fan for filling factors of ν>2. However, at ν<2, the lowest Landau-level (LL) transition reveals the charged-exciton behavior with an abrupt changeover in the field dependence of the transition energy, whereas the intensities of other LL transitions in the same Landau fan diminish. When the density of free electrons in the ADQWs is about 1.4× 1011 cm-2, a new charged excitonic e2-hh1 transition also appears in the σ+ polarization at ν<2.

Original languageEnglish
Article number073305
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number7
DOIs
Publication statusPublished - 2007 Aug 8

Fingerprint

Semiconductor quantum wells
Photoluminescence
quantum wells
Magnetic fields
photoluminescence
Fans
magnetic fields
Electron transitions
fans
Excitons
Ground state
Modulation
Polarization
Electrons
free electrons
gallium arsenide
excitons
modulation
conduction
ground state

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Photoluminescence study of magnetic-field-induced excitonic transitions in Alx Ga1-x As GaAs asymmetric double quantum wells",
abstract = "We have observed magnetic-field-induced charged excitonic transitions from one-side-modulation-doped Alx Ga1-x As GaAs asymmetric double quantum wells (ADQWs) where two low-energy conduction subbands e1 and e2 are coupled strongly, whereas the heavy-hole ground state hh1 is localized mostly in a quantum well. In the presence of a magnetic field applied parallel to the growth axis, the photoluminescence spectrum of the e1-hh1 transition develops into a Landau fan for filling factors of ν>2. However, at ν<2, the lowest Landau-level (LL) transition reveals the charged-exciton behavior with an abrupt changeover in the field dependence of the transition energy, whereas the intensities of other LL transitions in the same Landau fan diminish. When the density of free electrons in the ADQWs is about 1.4× 1011 cm-2, a new charged excitonic e2-hh1 transition also appears in the σ+ polarization at ν<2.",
author = "Lee, {Kyu Seok} and Noh, {Sam Kyu} and Chang, {Soo Kyung}",
year = "2007",
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T1 - Photoluminescence study of magnetic-field-induced excitonic transitions in Alx Ga1-x As GaAs asymmetric double quantum wells

AU - Lee, Kyu Seok

AU - Noh, Sam Kyu

AU - Chang, Soo Kyung

PY - 2007/8/8

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N2 - We have observed magnetic-field-induced charged excitonic transitions from one-side-modulation-doped Alx Ga1-x As GaAs asymmetric double quantum wells (ADQWs) where two low-energy conduction subbands e1 and e2 are coupled strongly, whereas the heavy-hole ground state hh1 is localized mostly in a quantum well. In the presence of a magnetic field applied parallel to the growth axis, the photoluminescence spectrum of the e1-hh1 transition develops into a Landau fan for filling factors of ν>2. However, at ν<2, the lowest Landau-level (LL) transition reveals the charged-exciton behavior with an abrupt changeover in the field dependence of the transition energy, whereas the intensities of other LL transitions in the same Landau fan diminish. When the density of free electrons in the ADQWs is about 1.4× 1011 cm-2, a new charged excitonic e2-hh1 transition also appears in the σ+ polarization at ν<2.

AB - We have observed magnetic-field-induced charged excitonic transitions from one-side-modulation-doped Alx Ga1-x As GaAs asymmetric double quantum wells (ADQWs) where two low-energy conduction subbands e1 and e2 are coupled strongly, whereas the heavy-hole ground state hh1 is localized mostly in a quantum well. In the presence of a magnetic field applied parallel to the growth axis, the photoluminescence spectrum of the e1-hh1 transition develops into a Landau fan for filling factors of ν>2. However, at ν<2, the lowest Landau-level (LL) transition reveals the charged-exciton behavior with an abrupt changeover in the field dependence of the transition energy, whereas the intensities of other LL transitions in the same Landau fan diminish. When the density of free electrons in the ADQWs is about 1.4× 1011 cm-2, a new charged excitonic e2-hh1 transition also appears in the σ+ polarization at ν<2.

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