Dynamics of the in-plane charge separation front in a two-dimensional electron-hole gas

Chen, Gang; Rapaport, Ronen; Simon, Steven H.; Pfeiffer, L. N.; West, K. W.

doi:10.1103/physrevb.71.041301

Cited by 18 publications

(30 citation statements)

References 6 publications

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“…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. 7,9,17,18,26,28,29 Besides the inner ring, the external ring can be observed around the excitation spot 7,[36][37][38][39][40][41][42][43][44] and localized bright spot (LBS) rings can be observed around localized carrier sources. 7,36,[40][41][42][43]45 The external and LBS rings form on the boundaries between electron-rich and hole-rich regions; the former is created by current through the structure and the latter is created by optical excitation.…”

Section: Introductionmentioning

confidence: 92%

“…7,36,[40][41][42][43]45 The external and LBS rings form on the boundaries between electron-rich and hole-rich regions; the former is created by current through the structure and the latter is created by optical excitation. [36][37][38][39]42 At low temperatures, intensity modulation 7,36,[40][41][42][43][44] and spontaneous coherence of excitons 40,43,44 are observed in the external ring; intensity modulation 36 and spontaneous coherence of excitons 43 are also observed in the LBS rings. The exciton state with the spatial order of higher intensity exciton beads on a macroscopic length scale (up to ∼mm) is referred to as the macroscopically ordered exciton state (MOES).…”

Section: Introductionmentioning

confidence: 93%

“…11). [36][37][38][39]42 The external ring radius varies more quickly with P and V g than the inner ring radius; compare Figs. 8 and 10, 9 and 11.…”

Section: Appendix: Inner Ring Versus External Ringmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 93%

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Pattern formation in the exciton inner ring

et al. 2013

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“…The external ring itself forms on the interface between the electron-rich and hole-rich regions [29][30][31][32][33]. This interface is essential for the MOES since no spontaneous density modulation is observed in another exciton ring-the inner ring where no such interface is involved [3,34,35].…”

Section: Introductionmentioning

confidence: 99%

Reliability of InAs/GaAs Quantum Dot Lasers Epitaxially Grown on Silicon

Liu

Herrick

Ueda

et al. 2015

IEEE J. Select. Topics Quantum Electron.

111

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At low temperatures, indirect excitons formed at the in-plane electron-hole interface in a coupled-quantum-well structure undergo a spontaneous transition into a spatially modulated state. We report on the control of the instability wavelength, measurement of the dynamics of the exciton emission pattern, and observation of the fluctuation and commensurability effect of the exciton density wave. We found that fluctuations are suppressed when the instability wavelength is commensurate with defect separation along the exciton density wave. The commensurability effect is also found in numerical simulations within the model describing the exciton density wave in terms of an instability due to stimulated processes.

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“…[3,4] as the luminescence ring mechanism, and studied further in Refs. [5,6,[19][20][21]. For a restricted case, Ref.…”

Section: Diffusion-reaction Modelmentioning

confidence: 99%

Ring-shaped luminescence pattern in biased quantum wells studied as a steady-state reaction front

Haque

2006

Phys. Rev. E

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Under certain conditions, focused laser excitation in semiconductor quantum well structures can lead to charge separation and a circular reaction front, which is visible as a ring-shaped photoluminescence pattern. The diffusion-reaction equations governing the system are studied here with the aim of a detailed understanding of the steady state. The qualitative asymmetry in the sources for the two carriers is found to lead to unusual effects which dramatically affect the steady-state configuration. Analytic expressions are derived for carrier distributions and interface position for a number of cases. These are compared with steady-state information obtained from simulations of the diffusion-reaction equations.

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Dynamics of the in-plane charge separation front in a two-dimensional electron-hole gas

Cited by 18 publications

References 6 publications

Pattern formation in the exciton inner ring

Pattern formation in the exciton inner ring

Reliability of InAs/GaAs Quantum Dot Lasers Epitaxially Grown on Silicon

Ring-shaped luminescence pattern in biased quantum wells studied as a steady-state reaction front

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