Linewidth dependence of radiative exciton lifetimes in quantum wells

Feldmann, Jochen; Peter, G.; Göbel, E. O.; Dawson, Philip E.; Moore, K. J.; Foxon, C.T.; Elliott, R. J.

doi:10.1103/physrevlett.59.2337

Cited by 1,093 publications

(590 citation statements)

References 14 publications

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“…Our values are comparable with those found by Ron et aL34 and I?elchnan et al 35 and they slowly increase with magnetic field. In the case of the X; state, its life-time is slight ly larger than that of the neutral exciton.…”

Section: And Discussionsupporting

confidence: 82%

Crossing behavior of the singlet and triplet state of the negatively charged magnetoexciton in aGaAs/Al0.55
Kim¹,
Simmons²,
Reno³
2000
Phys. Rev. B
25
1
17
0
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(November 22, 1999) dsfl fls Polarized magneto-photoluminescence (MPL) measurements on a high mobility &doped a GaAs/AIGaAs single quantum well from o-60T at temperatures between 0.37-2.lK are reported. In addition to the neutra~heavy hole magneto-exciton (X"), the singlet (XI) and triplet (X;) states of the negatively charged magneto-exciton are observed in both polarizations. 'The energy dispersive and time-resolved MPL data suggest that their development is fundamentally related to the formation of the neutral magneto-exciton. At a magnetic field of 40T the singlet and the triplet states cross as a result of the role played by the higher Landau levels and higher energy subbands in their energetic evolution, confirming theoretical predictions. We also observed the formation of two higher energy peaks. One of them is completely right circularly polarized and its appearance can be considered a result of the electron-hole exchange interaction enhancement with an associated electron g-factor of 3.7 times the bulk value. The other peak completely dominates the MPL spectrum at fields around 30T. Its behavior with magnetic field and temperature indicates that it may be related to previous anomalies observed in the integer and fractional quantum Hall regimes.

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Section: And Discussionsupporting

confidence: 82%

Crossing behavior of the singlet and triplet state of the negatively charged magnetoexciton in aGaAs/Al0.55
Kim¹,
Simmons²,
Reno³
2000
Phys. Rev. B
25
1
17
0
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“…A similar effect was observed in other aggregates, 29 in light harvesting antennas 30 and in excitonic systems like multiple quantum wells ͑MQWs͒. 31 This dramatic shortening of the low-temperature fluorescence lifetime in these excitonic systems is attributed to cooperative emission known as superradiance. The lengthening of the superradiant lifetime at higher temperatures is generally attributed to the fact that the exciton scatters during its lifetime to other ͑dark͒ states in the exciton band.…”

Section: Introductionmentioning

confidence: 65%

Exciton superradiance in aggregates: The effect of disorder, higher order exciton-phonon coupling and dimensionality

Potma

Wiersma

1998

The Journal of Chemical Physics

137

129

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In this paper a detailed theoretical analysis is presented of the temperature dependent radiative decay in aggregates of pseudoisocyanine ͑PIC͒. Our approach extends the original linear exciton-phonon coupling model used by Spano, Kuklinsky, and Mukamel ͓Phys. Rev. Lett. 65, 212 ͑1990͔͒ including static disorder and second order exciton-phonon interactions. It is shown that for a one-dimensional exciton model neither of these additional effects alone or in combination with linear electron-phonon coupling can explain the steep rise in radiative lifetime at 40 K observed in the J-aggregate of PIC. However, when the aggregate assembles into a two-dimensional bricklike structure its radiative dynamics can be simulated, with linear exciton-optical phonon coupling as the only source for exciton scattering. Exciton-phonon scattering transfers oscillator strength from the kϭ0 state to other band states and also generates a nonequilibrium population among the exciton states, which persists during the superradiant decay. These effects together explain the marked temperature dependence of the radiative lifetime of the PIC J aggregate. When disorder limits the coherence length at low temperatures to a few molecules, as seems the case in several light harvesting complexes, the exciton population can equilibrate on the time scale of the superradiance. This situation pertains to the strong collision limit of the master equation, where the radiative decay is insensitive to details of the electron-phonon coupling, but only senses change in the thermal population among the exciton states.

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“…The optical decay rate opt (T 0 ,T ) includes the fact that only excitons in the low-energy, optically active states may emit light. [33][34][35] The optical decay rate also includes the fact that the indirect excitons in a GaAs CQW may have four spin projections on the z direction J z = −2, − 1, + 1, + 2; the states J z = ±1 emit light, whereas the states J z = ±2 are dark. 54 The splitting between the J z = ±1 and J z = ±2 states in the studied structure is small, 43,55,56 smaller than the thermal energy for the temperatures studied in this work; therefore we approximate the distribution of indirect excitons between the J z = ±1 and J z = ±2 states as even.…”

Section: B Simulationsmentioning

confidence: 99%

“…The inner ring occurs due to the heating of the exciton gas by laser excitation. The heating results in a reduction in the occupation of the low-energy optically active exciton states [33][34][35] and, in turn, the exciton emission intensity. When excitons travel away from the excitation spot they thermalize to the lattice temperature so that the emission intensity increases outside of the excitation spot forming the inner ring.…”

Section: Introductionmentioning

confidence: 99%

Pattern formation in the exciton inner ring

et al. 2013

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We report on the two-beam study of indirect excitons in the inner ring in the exciton emission pattern. One laser beam generates the inner ring and a second weaker beam is positioned in the inner ring. The beam positioned in the inner ring is found to locally suppress the exciton emission intensity. We also report on the inner ring fragmentation and formation of multiple rings in the inner ring region. These features are found to originate from a weak spatial modulation of the excitation beam intensity in the inner ring region. The modulation of exciton emission intensity anticorrelates with the modulation of the laser excitation intensity. The three phenomena-inner ring fragmentation, formation of multiple rings in the inner ring region, and emission suppression by a weak laser beam in the inner ring-have a common feature: a reduction of exciton emission intensity in the region of enhanced laser excitation. This effect is explained in terms of exciton transport and thermalization.

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Linewidth dependence of radiative exciton lifetimes in quantum wells

Cited by 1,093 publications

References 14 publications

Crossing behavior of the singlet and triplet state of the negatively charged magnetoexciton in aGaAs/Al0.55
Kim¹,
Simmons²,
Reno³
2000
Phys. Rev. B
25
1
17
0
View full text Add to dashboard Cite

Crossing behavior of the singlet and triplet state of the negatively charged magnetoexciton in aGaAs/Al0.55
Kim¹,
Simmons²,
Reno³
2000
Phys. Rev. B
25
1
17
0
View full text Add to dashboard Cite

Exciton superradiance in aggregates: The effect of disorder, higher order exciton-phonon coupling and dimensionality

Pattern formation in the exciton inner ring

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Linewidth dependence of radiative exciton lifetimes in quantum wells

Cited by 1,093 publications

References 14 publications

Crossing behavior of the singlet and triplet state of the negatively charged magnetoexciton in aGaAs/Al0.55Kim1, Simmons2, Reno3 2000Phys. Rev. B251170View full textAdd to dashboardCite

Crossing behavior of the singlet and triplet state of the negatively charged magnetoexciton in aGaAs/Al0.55Kim1, Simmons2, Reno3 2000Phys. Rev. B251170View full textAdd to dashboardCite

Exciton superradiance in aggregates: The effect of disorder, higher order exciton-phonon coupling and dimensionality

Pattern formation in the exciton inner ring

Contact Info

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About

Crossing behavior of the singlet and triplet state of the negatively charged magnetoexciton in aGaAs/Al0.55
Kim¹,
Simmons²,
Reno³
2000
Phys. Rev. B
25
1
17
0
View full text Add to dashboard Cite

Crossing behavior of the singlet and triplet state of the negatively charged magnetoexciton in aGaAs/Al0.55
Kim¹,
Simmons²,
Reno³
2000
Phys. Rev. B
25
1
17
0
View full text Add to dashboard Cite