Excitonic Absorption in a Quantum Dot

Hawrylak, Paweł; Narvaez, Gustavo A.; Bayer, М.; Forchel, A.

doi:10.1103/physrevlett.85.389

Cited by 121 publications

(82 citation statements)

References 25 publications

(10 reference statements)

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“…Neither of these corresponds to LO phonon energies of the materials in our sample. The interpretation of the observed PLE peaks is rather consistent with the interpretation of Hawrylak et al 7 who performed single-dot PLE on similar types of QDs and attributed observed resonances to interband transitions between p-and d-shell QD bound states.…”

Section: Resultssupporting

confidence: 74%

“…However, it has been shown that the presence of excited states, through configuration mixing, will influence the energy shell structure of all bound states, including the ground state. 7 Simply put, maximizing the application potential of QD systems requires understanding and modeling their energy shell structure, including the excited states, as precisely as possible.…”

Section: Introductionmentioning

confidence: 99%

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Single-exciton energy shell structure in InAs/GaAs quantum dots

et al. 2008

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Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Single-exciton energy shell structure in InAs/GaAs quantum dots Awirothananon, S.; Raymond, S.; Studenikin, S.; Vachon, M.; Render, W.; Sachrajda, A.; Wu, X.; Babinski, A.; Potemski, M.; Fafard, S.; Cheng, S.J.; Korkusinski, M.; Hawrylak, P.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=fr L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21274614&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21274614&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1103/PhysRevB.78.235313 Physical Review B -Condensed Matter and Materials Physics, 78, 23, 2008Single-exciton energy shell structure in InAs/GaAs quantum dots The energy shell structure of a single exciton confined in a self-assembled quantum dot ͑QD͒, including excited states, is studied in a regime where the direct Coulomb attraction energy is comparable to the kinetic energy of the carriers. This is achieved via magnetophotoluminescence excitation spectroscopy experiments, where a magnetic field applied perpendicular to the plane of the QD is used to reveal the angular-momentum content of energy shells. The absorption spectrum of the QDs is modeled, and comparison with experiment allows us to relate the observed transitions to interband QD bound-state transitions. The blueshift of the absorption peaks compared to the emission peaks is then interpreted in terms of many-body interactions, and we show that for a highly symmetric situation, the observed energy difference gives a direct measurement of the extra exchange energy gained upo...

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Section: Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Single-exciton energy shell structure in InAs/GaAs quantum dots

et al. 2008

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“…8 LO-phonon replicas have been resolved for single InAs/GaAs QDs in PL-excitation spectroscopy, but the coupling strength was not extracted, nor its association with charged excitonic states investigated. 10 For single CdSe/ZnCdSe QDs, data of first-and second-order LO-phonon replicas for both the exciton and the biexciton have been reported. 11 The polar coupling in such II-VI compounds is larger compared to III-V materials, and the HuangRhys parameter was determined to be 0.035 and 0.032 for the exciton and biexciton, respectively.…”

Section: Introductionmentioning

confidence: 99%

Phonon replicas of charged and neutral exciton complexes in single quantum dots

et al. 2010

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The longitudinal-optical ͑LO͒-phonon coupling is experimentally examined by the optical decay of various charged and neutral exciton species in single quantum dots, and the related Huang-Rhys parameters are extracted. A positive trion exhibits significantly weaker LO-phonon replicas in the photoluminescence spectrum than the neutral and negatively charged species. Model computations show that the strength of the replicas is determined by the Coulomb interactions between electrons and holes, which modify the localization of the envelope wave functions and the net charge distribution.

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“…Due to the pronounced and so far unavoidable growth-induced inhomogeneous broadening in ensembles of semiconductor QDs, the recent development of single QD spectroscopy has provided a wealth of new information (15). It is now understood that sufficiently confined QDs resemble in many respect atomic systems, showing atomic-like densities of states (16; 17; 18), a shell-like absorption spectrum (19) and -at low temperatures - (20; 21). In addition, the large extent of the electron wave function in QDs gives rise to excitonic dipole moments of 10 -100 Debye, much larger than those of atomic systems.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Coherent Spectroscopy of Single Semiconductor Quantum Dots

Lienau

Unold

Mueller

et al. 2008

Semiconductor Nanostructures

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Excitonic and spin excitations of single semiconductor quantum dots currently attract attention as possible candidates for solid state based implementations of quantum logic devices. Due to their rather short decoherence times in the picosecond to nanosecond range, such implementations rely on using ultrafast optical pulses to probe and control coherent polarizations. In this article, we review our recent work on combining ultrafast spectroscopy and near-field microscopy to probe the nonlinear optical response of a single quantum dot and of a pair of dipolecoupled quantum dots on a femtosecond time scale. We demonstrate coherent control of both amplitude and phase of the coherent quantum dot polarization by studying Rabi oscillations and the optical Stark effect in an individual dot. By probing Rabi oscillations in a pair of dots, we identify couplings between permanent excitonic dipole moments. Our results show that although semiconductor quantum dots resemble in many respects atomic systems, Coulomb many-body interactions can contribute significantly to their optical nonlinearities on ultrashort time scales. This paves the way towards the realization of potentially scalable nonlocal quantum gates in chains of dipole-coupled dots, but also means that decoherence phenomena induced by many-body interactions need to be carefully controlled.

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Excitonic Absorption in a Quantum Dot

Cited by 121 publications

References 25 publications

Single-exciton energy shell structure in InAs/GaAs quantum dots

Single-exciton energy shell structure in InAs/GaAs quantum dots

Phonon replicas of charged and neutral exciton complexes in single quantum dots

Ultrafast Coherent Spectroscopy of Single Semiconductor Quantum Dots

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