Biexciton versus Exciton Lifetime in a Single Semiconductor Quantum Dot

Bacher, G.; Weigand, Rudolf; Seufert, Jochen; Kulakovskiĭ, V. D.; Gippius, N. A.; Forchel, A.; Leonardi, K.; Hommel, D.

doi:10.1103/physrevlett.83.4417

Cited by 190 publications

(154 citation statements)

References 23 publications

Supporting

Mentioning

128

Contrasting

Order By: Relevance

“…Radiative recombination rates are strongly affected by the quantum correlation of electrons and holes [29]. For the strong quantum confinement regime it is expected a ratio 0 / = 2.…”

Section: Discussionmentioning

confidence: 99%

Time resolved emission at 1.3 μm of a single InAs quantum dot by using a tunable fibre Bragg grating

et al. 2013

View full text Add to dashboard Cite

Photoluminescence and time resolved photoluminescence from single metamorphic InAs/GaAs quantum dots (QDs) emitting at 1.3 μm have been measured by means of a novel fibre-based characterization set-up. We demonstrate that the use of a wavelength tunable Fibre Bragg Grating (FBG) filter increases the light collection efficiency by more than one order of magnitude as compared to a conventional grating monochromator. We identified single charged exciton and neutral biexciton transitions on the framework of a random population model. The QD recombination dynamics under pulsed excitation can be understood under the weak quantum confinement potential limit and the interaction between carriers at the Wetting Layer (WL) and QD states. 68.65.La, 78.47.jd, 42.79.Ci, Introduction: PACS:

show abstract

“…Radiative recombination rates are strongly affected by the quantum correlation of electrons and holes [29]. For the strong quantum confinement regime it is expected a ratio 0 / = 2.…”

Section: Discussionmentioning

confidence: 99%

Time resolved emission at 1.3 μm of a single InAs quantum dot by using a tunable fibre Bragg grating

et al. 2013

View full text Add to dashboard Cite

show abstract

“…[10][11][12][13][14][15][16][17][18][19][20][21][22][23] The dependence of the recombination rates of neutral exciton, biexciton, and multiexciton complexes on Coulomb interactions has been also described in a number of papers. [24][25][26][27][28][29][30] Much less is known about the recombination rates of positively ͑X + ͒ and negatively ͑X − ͒ charged excitons ͑trions͒. 20,31,32 This is nonetheless an interesting problem.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence spectroscopy of trions in quantum dots: A theoretical description

Climente

Bertoni²,

Goldoni

2008

Phys. Rev. B

View full text Add to dashboard Cite

We present a full configuration-interaction study of the spontaneous recombination of neutral and singly charged excitons ͑trions͒ in semiconductor quantum dots from weak-to strong-coupling regimes. We find that the enhancement of the recombination rate of neutral excitons with increasing dot size is suppressed for negative trions and even reversed for positive trions. Our findings agree with recent comprehensive photoluminescence experiments in self-assembled quantum dots ͓P. Dalgarno et al., Phys. Rev. B 77, 245311 ͑2008͔͒ and confirm the major role played by correlations in the valence band. The effect of the temperature on the photoluminescence spectrum and that of the ratio between the electron and hole wave-function length scales are also described.

show abstract

“…The results show that spin non-degeneracy due to quantumdot asymmetry is a significant obstacle to the realization of an entangled-photon generation device. [4,5,6], but they can also generate sequences of photons in a radiative cascade [7,8]. In such a cascade, each photon has a unique wavelength, and the photons may also have correlated, or even entangled [9] polarizations.…”

mentioning

confidence: 99%

Polarization-correlated photon pairs from a single quantum dot

et al. 2002

View full text Add to dashboard Cite

Polarization correlation in a linear basis, but not entanglement, is observed between the biexciton and single-exciton photons emitted by a single InAs quantum dot in a two-photon cascade. The results are well described quantitatively by a probabilistic model that includes two decay paths for a biexciton through a non-degenerate pair of one-exciton states, with the polarization of the emitted photons depending on the decay path. The results show that spin non-degeneracy due to quantumdot asymmetry is a significant obstacle to the realization of an entangled-photon generation device. [4,5,6], but they can also generate sequences of photons in a radiative cascade [7,8]. In such a cascade, each photon has a unique wavelength, and the photons may also have correlated, or even entangled [9] polarizations.In the two-photon cascade, a biexciton singlet state (two electrons and two holes, 2X) decays to one of two optically active single-exciton states (one electron and one hole, 1X) by emitting one photon, and then to the empty-dot state by emitting a second photon. In theory, the polarization properties of photon pairs emitted through these two decay paths result entirely from properties of the optically-active 1X doublet [10,11,12]. For a symmetric quantum dot, the two 1X states are degenerate, and the two decay paths become "indistinguishable," ideally producing polarization-entangled photons [9]. For an asymmetric quantum dot, the 1X doublet is split through the electron-hole exchange interaction into states that couple to photons having orthogonal linear polarizations [13,14,15]. If this splitting is much larger than the radiative linewidth, then the two paths become "distinguishable," with one decay path producing two horizontally-polarized photons and the other producing two vertically polarized photons, for example. In this case, polarization correlation is expected only in a single, preferred basis. Some additional factors are also important, such as spin flip [16] and decoherence processes [17,18,19] that randomize the intermediate 1X state, and valence-band mixing [20].In this article, we present an experimental study of the polarization correlation properties of photon pairs emitted through biexciton decay in a single InAs quantum dot. While temporal correlations between 1X and 2X photons have previously been seen [21], polarization correlation has not yet been reported, to our knowledge, although a lack of such correlation has been mentioned elsewhere [22]. For our sample, we observe a strong polarization correlation in a linear polarization basis, verifying the theoretical picture described above. However, we do not observe entanglement, suggesting that quantum-dot asymmetry is an obstacle to realizing an entangled photon source.A sample was fabricated containing self-assembled InAs quantum dots [3] grown by molecular-beam epitaxy on a (001) GaAs substrate, capped by 75 nm of GaAs. A high growth temperature increased intermixing between the InAs and surrounding GaAs, shortening the quantum-dot emission wa...

show abstract

Biexciton versus Exciton Lifetime in a Single Semiconductor Quantum Dot

Cited by 190 publications

References 23 publications

Time resolved emission at 1.3 μm of a single InAs quantum dot by using a tunable fibre Bragg grating

Time resolved emission at 1.3 μm of a single InAs quantum dot by using a tunable fibre Bragg grating

Photoluminescence spectroscopy of trions in quantum dots: A theoretical description

Polarization-correlated photon pairs from a single quantum dot

Contact Info

Product

Resources

About