Resonant Rayleigh Scattering from an Inhomogeneously Broadened Transition: A New Probe of the Homogeneous Linewidth

Hegarty, J.; Sturge, M. D.; Weisbuch, C.; Gossard, A. C.; Wiegmann, W.

doi:10.1103/physrevlett.49.930

Cited by 197 publications

(68 citation statements)

References 5 publications

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“…The isolated points plotted on figure 1 are resonant Rayleigh scattering amplitudes measured at a discrete set of frequencies, taken from data published in [15]. Both the mean and the variance of these data are remarkably close to the theoretical distribution of local minima, curve (d), which is a plot of (2.3) with a = 1, and with the mean and variance chosen to match those of the Gaussian fit to the absorption spectrum.…”

Section: The Statistical Topographic Modelmentioning

confidence: 96%

“…Our second, more important, point concerns resonant Rayleigh scattering experiments on excitons, such as that discussed in [15]. ¿From the discussion above, it is apparent that it would be desirable to have a more direct probe of the density of local minima of the effective potential, to facilitate comparison between theory and experiment.…”

Section: The Statistical Topographic Modelmentioning

confidence: 99%

“…We also propose a reason for the small discrepancy between theory and experiment, and a variant of the experimental approach which may give a better agreement with experiment. Figure 1 shows the absorption (a) and luminescence (b) spectra of excitons in a semiconductor heterostructure: the data are taken from [15]. First consider the form of the absorption peak.…”

Section: The Statistical Topographic Modelmentioning

confidence: 99%

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Distribution of oscillator strengths for recombination of localised excitons in two dimensions

Wilkinson

Walker

Chinyama

1997

Chaos, Solitons & Fractals

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We investigate the distribution of oscillator strengths for the recombination of excitons in a two dimensional sample, trapped in local minima of the confinement potential: the results are derived from a statistical topographic model of the potential. The predicted distribution of oscillator strengths is very different from the Porter-Thomas distribution which usually characterises disordered systems, and is notable for the fact that small oscillator strengths are extremely rare.

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Section: The Statistical Topographic Modelmentioning

confidence: 96%

Section: The Statistical Topographic Modelmentioning

confidence: 99%

Section: The Statistical Topographic Modelmentioning

confidence: 99%

See 1 more Smart Citation

Distribution of oscillator strengths for recombination of localised excitons in two dimensions

Wilkinson

Walker

Chinyama

1997

Chaos, Solitons & Fractals

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“…These emissions yield information on the energy level scheme and nature of these levels, as well as on their dynamics. This is well demonstrated in 2D semiconductor quantum wells: early work on resonant Rayleigh scattering demonstrated exciton localization effects and the existence of a mobility edge [55] while more recent studies dealt with the dynamics of resonant Rayleigh scattering [56,57] and the speckle spectroscopy of disorder [58]. Rayleigh scattering of cavity-polariton under resonant excitation exhibits remarkable features which impact on light scattering [59].…”

Section: Rayleigh Scattering (2000)mentioning

confidence: 96%

Early stages of continuous wave experiments on cavity‐polaritons

Houdré

2005

Physica Status Solidi (b)

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“…We perform our measurements in a pump-probe configuration, creating the liquid by the laser diode pump and measuring the scattered intensity of a much weaker Ti:Sapphire probe, tuned to the NW exciton resonance. We use the fact that the RRS signal should be strongly enhanced at an exciton resonance, and its linewidth is a measure of the disorder in the sample [24,25]. Hence, the RRS of the NW direct exciton can serve as an effective probe for the changes induced by the liquid.…”

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confidence: 99%

Experimental Study of the Exciton Gas-Liquid Transition in Coupled Quantum Wells

et al. 2018

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We study the exciton gas-liquid transition in GaAs/AlGaAs coupled quantum wells. Dipolar excitons in coupled quantum wells (CQW) offer an interesting test bed for studying collective effects of an interacting quantum degenerate system [1, 2]. Their relatively light mass, which is smaller than that of a free electron, implies that the necessary conditions for achieving quantum degeneracy can occur already at cryogenic temperatures, and their strong dipole-dipole interaction may give rise to formation of ordered phases. Extensive attempts have been made over the past two decades to observe these phases and to determine the phase diagram of this system [3][4][5][6][7][8][9][10][11][12].In recent years there are mounting evidences for a phase transition that occurs at low temperatures in this system, yet its nature and thermodynamics remain open questions.Many of the studies are performed in a trap geometry, which confines the excitons to a narrow region around the illuminated spot [13,14], and evidences for condensation are found through photoluminescence (PL) anomalies: The appearance of spontaneous coherence [7], onset of non-radiative recombination ("PL darkening") [9] and large blueshift of the PL energy [10,11]. An alternative approach to study this phase transition uses an open geometry, where photo-excited carriers are free to move away from the illumination spot, and their diffusion is limited only by the mesa boundary. We have recently studied the behavior of indirect excitons in such an open geometry, and found an abrupt phase transition at a critical temperature and excitation power density [12]. The PL separates into two spatial regions, one which consists of electron-hole plasma and another that has a set of properties of a high density liquid.In this work we investigate this phase transition using spatially resolved PL and resonant Rayleigh scattering (RRS). Measuring the threshold power density as a function of temperature we determine the phase diagram of the system over the temperature range 0.1 -4.8K. Pump probe measurements, in which the liquid is created by a focused pump beam and studied by a much weaker probe, reveal that the liquid is dark and diffuses to large distances away from the illuminated spot, filling the entire area of the mesa at low temperatures. We find that the RRS spectrum narrows significantly and becomes uniform over macroscopic distances at the liquid phase, indicating that the disorder in the sample is effectively screened.The sample structure is identical to that used in [12] and consists of two GaAs quantum wells with well widths of 12 and 18 nm, separated by a 3-nm Al 0.28 Ga 0.72 As barrier. Top and bottom n-doped layers allow the application of voltage that shifts the energy levels of the wide well (WW) relative to the narrow well (NW) [15]. To create the liquid we apply voltages exceeding -2.4V and excite the system with a laser diode at energy of 1.590eV, focused to a Gaussian spot with 22µm half width at half maximum (HWHM) [16]. Figure 1 shows the evolution...

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Resonant Rayleigh Scattering from an Inhomogeneously Broadened Transition: A New Probe of the Homogeneous Linewidth

Cited by 197 publications

References 5 publications

Distribution of oscillator strengths for recombination of localised excitons in two dimensions

Distribution of oscillator strengths for recombination of localised excitons in two dimensions

Early stages of continuous wave experiments on cavity‐polaritons

Experimental Study of the Exciton Gas-Liquid Transition in Coupled Quantum Wells

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