Exciton pattern generation in GaAs/Al<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>Ga<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>As multiple quantum wells

Fluegel, B.; Alberi, Kirstin; Bhusal, L.; Mascarenhas, A.; Snoke, D. W.; Karunasiri, Gamani; Pfeiffer, L. N.; West, K. W.

doi:10.1103/physrevb.83.195320

Cited by 6 publications

(5 citation statements)

References 13 publications

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“…In those works, the inhomogeneities in the condensate density were caused by the interactions of polaritons with a cloud of non-condensed excitons and with structural defects in the cavity. The ring pattern formation was earlier demonstrated for the dipolar excitons in coupled QWs and multiple QWs in previous experimental and theoretical works [3,24,58,68,69]. In spatially resolved measurements, the photoluminescence of the dipolar exciton pattern was seen as a central laser excitation spot surrounded by a sharp ring-shaped region with a diameter much larger than that for the spot and with large dark regions separating the two.…”

supporting

confidence: 55%

Spontaneous formation and nonequilibrium dynamics of a soliton-shaped Bose-Einstein condensate in a trap

Berman¹,

Kezerashvili²,

Kolmakov³

et al. 2015

Phys. Rev. E

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The Bose-stimulated self-organization of a quasi-two dimensional non-equilibrium Bose-Einstein condensate in an in-plane potential is proposed. We obtained the solution of the nonlinear, drivendissipative Gross-Pitaevskii equation for a Bose-Einstein condensate trapped in an external asymmetric parabolic potential within the method of the spectral expansion. We found that, in sharp contrast to previous observations, the condensate can spontaneously acquire a soliton-like shape for spatially homogenous pumping. This condensate soliton performs oscillatory motion in a parabolic trap and, also, can spontaneously rotate. Stability of the condensate soliton in the spatially asymmetric trap is analyzed. In addition to the nonlinear dynamics of non-equilibrium Bose-Einstein condensates of ultra-cold atoms, our findings can be applied to the condensates of quantum well excitons and cavity polaritons in semiconductor heterostructure, and to the condensates of photons.

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supporting

confidence: 55%

Spontaneous formation and nonequilibrium dynamics of a soliton-shaped Bose-Einstein condensate in a trap

Berman¹,

Kezerashvili²,

Kolmakov³

et al. 2015

Phys. Rev. E

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“…In addition, a narrow (inner) luminescence ring is formed around the excitation spot itself [6,[8][9][10]. On the one hand, it has been established that the outer-ring signals the recombination between optically and electrically injected carriers [11,12]. On the other hand, the origin of the inner photoluminescence ring has first been attributed to a laser induced heating of indirect excitons: combined experimental and theoretical studies have shown that the inner luminescence ring is the signature of the transport and subsequent cooling of the indirect excitons outside the excitation spot [8,10,13].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamics and inner-ring photoluminescence pattern of indirect excitons

et al. 2012

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We study the photoluminescence dynamics of ultra-cold indirect excitons optically created in a double quantum well heterostructure. Above a threshold laser excitation, our experiments reveal the apparition of the so-called inner photoluminescence ring. It is characterized by a ring shaped photoluminescence which suddenly collapses once the laser excitation is terminated. We show that the spectrally resolved dynamics is in agreement with an excitonic origin for the inner-ring which is formed due to a local heating of indirect excitons by the laser excitation. To confirm this interpretation and exclude the ionization of indirect excitons, we evaluate the excitonic density that is extracted from the energy of the photoluminescence emission. It is shown that optically injected carriers play a crucial role in that context as these are trapped in our field-effect device and then vary the electrostatic potential controlling the confinement of indirect excitons. This disruptive effect blurs the estimation of the exciton concentration. However, it suppressed by smoothing the electrostatic environment of the double quantum well by placing the latter behind a super-lattice. In this improved geometry, we then estimate that the exciton density remains one order of magnitude smaller than the critical density for the ionization of indirect excitons (or Mott transition) in the regime where the inner-ring is formed.

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“…However, more convincing evidences for observing the excitonic BEC in semiconductors are still desirable. Recently, the indirect excitons between two coupled quantum wells demonstrated a long-range coherent transport with a distance from a few hundreds of micrometers up to 1 mm [7,[11][12][13][14][15]. However, the mechanism for this long-distance coherent transport is still under debate, although several mechanisms have been proposed [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Resolving exciton diffusion in InGaAs quantum wells using micro-photoluminescence mapping with a lateral excitation

Cao

Qiu

et al. 2013

Semicond. Sci. Technol.

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We report a spatially resolved photoluminescence mapping of InGaAs quantum wells. The photoluminescence was collected on top of the quantum well, with a HeNe laser pumping horizontally or vertically. In the horizontal configuration, at temperature of 68 K, the spectral linewidth narrows from 2.8 to 2.2 meV with the peak shifting from 1.4425 to 1.4415 eV, while at 3.8 K these changes were not observed. This demonstrates that photo-generated carriers can diffuse away from the laser spot and relax to the lower energy states in the case when the charge carriers are thermally activated. The spectra narrowing in the vertical configuration, which could not be observed, is due to the fact that the emitted light was always collected from the same spot of the pumping laser without diffusion.

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Exciton pattern generation in GaAs/AlxGa1−xAs multiple quantum wells

Cited by 6 publications

References 13 publications

Spontaneous formation and nonequilibrium dynamics of a soliton-shaped Bose-Einstein condensate in a trap

Spontaneous formation and nonequilibrium dynamics of a soliton-shaped Bose-Einstein condensate in a trap

Nonlinear dynamics and inner-ring photoluminescence pattern of indirect excitons

Resolving exciton diffusion in InGaAs quantum wells using micro-photoluminescence mapping with a lateral excitation

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