Luminescence linewidths of excitons in GaAs quantum wells below 150 K

Lee, Johnson; Köteles, Emil S.; Vassell, M. O.

doi:10.1103/physrevb.33.5512

Cited by 448 publications

(283 citation statements)

References 13 publications

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“…38 The deviation of the fitting curve above 80 K for 0-0 LL and above 90 K for 1-1 LL is possibly associated with carrier delocalization and/or deionized impurities at high temperatures. 39 ⌫ 0 ͑ϳ1.9 meV͒ indicates that the SF pulse duration is shorter than 700 fs ͑ =2ប / ⌫ 0 ͒ while the temperature dependence of B TH ͑T͒ agrees with the dephasing dynamics in a zero-dimensional system.…”

Section: Temperature Dependencementioning

confidence: 51%

Cooperative recombination of electron-hole pairs in semiconductor quantum wells under quantizing magnetic fields

et al. 2010

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We present results of detailed investigations of light emission from semiconductor multiple quantum wells at low temperatures and high magnetic fields excited by intense femtosecond laser pulses. The intensity and linewidth as well as the directional and statistical properties of photoemission strongly depended on the magnetic field strength and pump laser fluence. We also investigated the effects of spot size, temperature, excitation geometry, and excitation pulse width on the emission properties. The results suggest that the initially incoherent photoexcited electron-hole pairs spontaneously form a macroscopic coherent state upon relaxation into the low-lying magnetoexcitonic states, followed by the emission of a superfluorescent burst of radiation. We have developed a theoretical model for superfluorescent emission from semiconductor quantum wells, which successfully explained the observed characteristics.

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Section: Temperature Dependencementioning

confidence: 51%

Cooperative recombination of electron-hole pairs in semiconductor quantum wells under quantizing magnetic fields

et al. 2010

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“…We also neglect the change in the exciton effective mass due to the magnetic field because we assume B to be small and the correction is quadratic in B . After the collisional relaxation (local thermalization inside the exciton gas) 15,127 and the phonon relaxation (cooling of the locally equilibrated exciton gas) 128 exciton occupancy n(p B ) "falls" down to the bottom of the shifted parabola (p B ≈ p 0 ). In this state the exciton system is "cold" and the group velocity of excitons averaged over n(p B ) is zero 129 :…”

Section: Physical Realizationmentioning

confidence: 99%

Anisotropic superfluidity of two-dimensional excitons in a periodic potential

2017

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We study anisotropies of helicity modulus, excitation spectrum, sound velocity and angle-resolved luminescence spectrum in a two-dimensional system of interacting excitons in a periodic potential. Analytical expressions for anisotropic corrections to the quantities characterizing superfluidity are obtained. We consider particularly the case of dipolar excitons in quantum wells. For GaAs/AlGaAs heterostructures as well as MoS2/hBN/MoS2 and MoSe2/hBN/WSe2 transition metal dichalcogenide bilayers estimates of the magnitude of the predicted effects are given. We also present a method to control superfluid motion and to determine the helicity modulus in generic dipolar systems.

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“…In fact, fits of the HWHM of the PL emission of quantum well structures have been used in the past for measuring the T dependence of the homogeneous broadening of excitons. 17 Before going on and discussing the experimental data, let us analyze the method for homogeneous broadening different from Lorentzian. This is because it has been recently pointed out that the phonon sideband in strongly confined QD is likely better approximated by a Gaussian, even if generally it does not follow a simple analytical expression.…”

Section: General Considerationsmentioning

confidence: 99%

Quantum dot decoherence measured by ensemble photoluminescence

Gurioli

Sanguinetti

Mano

et al. 2005

Journal of Applied Physics

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers)Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. We propose and experimentally demonstrate that a very simple, noninvasive, and common technique, i.e., standard nonresonant photoluminescence of large ensemble of quantum dots ͑QDs͒, can be used to determine the temperature dependence of homogeneous broadening. The method can be applied to a single quantum dot layer independently of the QD density and it allows to follow the increase of the homogeneous broadening up to high T. The experimental results show that different pictures apply depending on the QD size.

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Luminescence linewidths of excitons in GaAs quantum wells below 150 K

Cited by 448 publications

References 13 publications

Cooperative recombination of electron-hole pairs in semiconductor quantum wells under quantizing magnetic fields

Cooperative recombination of electron-hole pairs in semiconductor quantum wells under quantizing magnetic fields

Anisotropic superfluidity of two-dimensional excitons in a periodic potential

Quantum dot decoherence measured by ensemble photoluminescence

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