Non trivial behaviour of the photoluminescence transition intensities in a modulation doped GaAs/GaAlAs single quantum well in tilted magnetic field

Couzinet, B.; Dyakonov, Michel; Raymond, André; Elmezouar, I.; Kamal-Saadi, M.; Etienne, B.

doi:10.1016/s0038-1098(98)00026-x

Cited by 1 publication

(1 citation statement)

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“…1͑c͔͒ and high-energy, nonthermalized holes that occupy the corresponding valence-band Landau levels. 23 At low temperature, the energy relaxation of photoexcited holes occurs by emission of low-energy acoustic phonons. The lifetime associated with this process exceeds the 2DEG-hole radiative lifetime ͑due to the small e-h separation in MDQW's͒.…”

Section: B Numerical Simulation Of the Pl And Mpl Spectra: Nonthermamentioning

confidence: 99%

Microwave-modulated photoluminescence of a two-dimensional electron gas

et al. 2006

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The low-temperature photoluminescence ͑PL͒ of GaAs/ AlGaAs quantum wells and heterojunctions containing a high mobility two-dimensional electron gas ͑2DEG͒ is studied under microwave ͑mw͒ irradiation of 36 GHz. The analysis of the mw-modulated PL ͑MPL͒ spectra allows us to elucidate the effects of mw radiation on the 2DEG. For low magnetic field strengths ͑B Ͻ 0.5 T͒, we show that the MPL spectral shape is due to energy redistribution of the photoexcited holes, as affected by the mw-heated 2DEG. For the mechanism that causes the nonequilibrium hole-energy redistribution, we propose that it is the interaction of the holes with low-energy acoustic phonons emitted by the mw-heated 2DEG. This underlying physical mechanism gives rise to the optically detected 2DEG cyclotron resonance at low B. For B Ͼ 0.5 T, optically detected resonances are observed at B values that depend on the 2DEG density, and they occur near integer electron filling factors. We argue that these resonances result from a slight 2DEG density increase under mw irradiation with a concurrent, low-energy PL spectral shift due to small band-gap narrowing.

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Section: B Numerical Simulation Of the Pl And Mpl Spectra: Nonthermamentioning

confidence: 99%