Photon Storage with Nanosecond Switching in Coupled Quantum Well Nanostructures

Winbow, Alexander; Hammack, A. T.; Butov, L. V.; Gossard, A. C.

doi:10.1021/nl070386c

Cited by 40 publications

(49 citation statements)

References 19 publications

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“…3(a)] can be converted into IXs and stored in the EXAT source electrode. Alternatively, stored IXs can be reconverted to photons by selecting an appropriate source voltage to reduce the IX recombination lifetime [34]. The EXAT source can act, therefore, as a voltage-tunable location for photon-to-exciton interconversion as well as for IX storage.…”

Section: Acoustic Exciton Multiplexer-exammentioning

confidence: 99%

Scalable interconnections for remote indirect exciton systems based on acoustic transport

et al. 2014

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Excitons, quasiparticles consisting of electron-hole pairs bound by the Coulomb interaction, are a potential medium for the processing of photonic information in the solid state. Information processing via excitons requires efficient techniques for the transport and manipulation of these uncharged particles. We have carried out a detailed investigation of the transport of excitons in GaAs quantum wells by surface acoustic waves. Based on these results, we introduce here a concept for the interconnection of multiple remote exciton systems based on the long-range transport of dipolar excitons by a network of configurable interconnects driven by acoustic wave beams. By combining this network with electrostatic gates, we demonstrate an integrated exciton multiplexer capable of interconnecting, gating, and routing exciton systems separated by millimeter distances. The multiplexer provides a scalable platform for the manipulation of exciton fluids with potential applications in information processing.

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Section: Acoustic Exciton Multiplexer-exammentioning

confidence: 99%

Scalable interconnections for remote indirect exciton systems based on acoustic transport

et al. 2014

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“…This situation is equivalent to the case of exciton storage in coupled quantum wells. 25,26,48 Furthermore, virtually all of the tetrapods must have such trap sites since, at low excitation density, the relative fluorescence quenching tends towards 100% [ Fig. 1(c)].…”

Section: B the Role Of Localized Trap Statesmentioning

confidence: 99%

Exciton storage in CdSe/CdS tetrapod semiconductor nanocrystals: Electric field effects on exciton and multiexciton states

et al. 2012

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CdSe/CdS nanocrystal tetrapods are interesting building blocks for excitonic circuits, where the flow of excitation energy is gated by an external stimulus. The physical morphology of the nanoparticle, along with the electronic structure, which favors electron delocalization between the two semiconductors, suggests that all orientations of a particle relative to an external electric field will allow for excitons to be dissociated, stored, and released at a later time. While this approach, in principle, works, and fluorescence quenching of over 95% can be achieved electrically, we find that discrete trap states within the CdS are required to dissociate and store the exciton. These states are rapidly filled up with increasing excitation density, leading to a dramatic reduction in quenching efficiency. Charge separation is not instantaneous on the CdS excitonic antennae in which light absorption occurs, but arises from the relaxed exciton following hole localization in the core. Consequently, whereas strong electromodulation of the core exciton is observed, the core multiexciton and the CdS arm exciton are not affected by an external electric field.

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“…After a pump pulse creating 2D dipolar excitons in a QW they thermalize locally quite fast 12,13 . The excitons can then cool down to low temperatures 14 due to the interaction with the semiconductor lattice 15 , as their lifetime is sufficiently long 10,16 . Disorder (due to impurities and interface roughness) 17,18 , inevitably present in semiconductors, is screened by the interexcitonic interactions 19 and is usually weak in wide single QWs 10,20 .…”

Section: Introductionmentioning

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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Photon Storage with Nanosecond Switching in Coupled Quantum Well Nanostructures

Cited by 40 publications

References 19 publications

Scalable interconnections for remote indirect exciton systems based on acoustic transport

Scalable interconnections for remote indirect exciton systems based on acoustic transport

Exciton storage in CdSe/CdS tetrapod semiconductor nanocrystals: Electric field effects on exciton and multiexciton states

Anisotropic superfluidity of two-dimensional excitons in a periodic potential

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