Polarization-entangled photons produced with high-symmetry site-controlled quantum dots

Mohan, Arun; Felici, Marco; Gallo, Pascal; Dwir, B.; Rudra, A.; Faist, Jérôme; Kapon, E.

doi:10.1038/nphoton.2010.2

Cited by 171 publications

(130 citation statements)

References 33 publications

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“…The consideration of polarization degree of freedom in electromagnetic waves paves the way for a variety of novel optical effects, like optomechanical forces 15 and mimicking spintronics 16 and spin-based electronic circuits 17 , where additional (spinor) degree of freedom extends the space of scalar wavefunctions to vectorial variables. An optical analogue of the inverse SHE described here in scattering of highly confined plasmonic waves on metal-dielectric interface, capable of carrying transverse spin, may ultimately serve as the platform for conventional or quantum electromagnetic signal processing, providing, among others, an integrated source of LCP/RCP-entangled photons 18,19 , orbital angular momentum entanglement 20,21 and platforms for testing fundamental laws of nature 22 . Being a fundamental optical effect, it also brings crossdisciplinary similarities, for example, spin-current injections and related effects in solid-state electronic devices.…”

Section: Resultsmentioning

confidence: 99%

Spin–orbit coupling in surface plasmon scattering by nanostructures

et al. 2014

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The spin Hall effect leads to the separation of electrons with opposite spins in different directions perpendicular to the electric current flow because of interaction between spin and orbital angular momenta. Similarly, photons with opposite spins (different handedness of circular light polarization) may take different trajectories when interacting with metasurfaces that break spatial inversion symmetry or when the inversion symmetry is broken by the radiation of a dipole near an interface. Here we demonstrate a reciprocal effect of spin-orbit coupling when the direction of propagation of a surface plasmon wave, which intrinsically has unusual transverse spin, determines a scattering direction of spin-carrying photons. This spin-orbit coupling effect is an optical analogue of the spin injection in solid-state spintronic devices (inverse spin Hall effect) and may be important for optical information processing, quantum optical technology and topological surface metrology.

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Section: Resultsmentioning

confidence: 99%

Spin–orbit coupling in surface plasmon scattering by nanostructures

et al. 2014

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“…Firstly, the basic idea can be easily generalized to study the optical properties of high-symmetric QDEs. Although the two bright states are degenerate for QDs with C 3v or D 2d symmetry [40], the random term V 1 can still render the probability of finding QDs with vanishing FSS small, as seen in recent experiments [41][42][43]. For high-symmetric QDEs, δ 0 = 0, thus only two independent parameters are required to fully characterize the statistical properties of FSS and polarization angle.…”

Section: Qdsmentioning

confidence: 99%

Statistical properties of exciton fine structure splitting and polarization angles in quantum dot ensembles

et al. 2014

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We propose an effective model to describe the statistical properties of exciton fine structure splitting (FSS) and polarization angle of quantum dot ensembles (QDEs). We derive the distributions of FSS and polarization angle for QDEs and show that their statistical features can be fully characterized using at most three independent measurable parameters. The effective model is confirmed using atomistic pseudopotential calculations as well as experimental measurements for several rather different QDEs. The model naturally addresses three fundamental questions that are frequently encountered in theories and experiments: (I) Why the probability of finding QDs with vanishing FSS is generally very small? (II) Why FSS and polarization angle differ dramatically from QD to QD? and (III) Is there any direct connection between FSS, optical polarization and the morphology of QDs? The answers to these fundamental questions yield a completely new physical picture for understanding optical properties of QDEs.

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“…Only recently, highly symmetric pyramidal QDs grown on {111} surfaces have emerged as interesting quantum structures in which zero fine-structure splitting of the neutral exciton was predicted 25,26 and eventually observed, [27][28][29][30] and for which the entanglement of polarized photon pairs was demonstrated. 31 It is our purpose in this paper to develop a general theoretical model of the Zeeman effects on the quantum states of excitons in highly symmetric QDs and to compare its predictions to experimental studies performed on magnetoexcitons confined in pyramidal QDs grown on (111)B GaAs substrates. 32,33 The underlying idea is to account for the interplay between Coulomb and Zeeman interactions by implementing an effective Hamiltonian formalism in the basis of the exciton states that is solely based on symmetry arguments.…”

Section: Introductionmentioning

confidence: 99%

Intertwining of Zeeman and Coulomb interactions on excitons in highly symmetric semiconductor quantum dots

Oberli

2012

Phys. Rev. B

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We present an experimental study and develop a group theoretical analysis of the Zeeman effect on excitons in pyramidal semiconductor quantum dots possessing the symmetries of the C 3v point group. The magnetic field dependence of the emission pattern originating from neutral exciton states is investigated in both the Faraday and Voigt configurations. The Zeeman doublet splitting of the "bright" exciton states varies linearly with the magnetic field strength in each configuration while the intensity of the "dark" exciton transitions exhibit a nonlinear dependence. We demonstrate that these observations originate from the intertwining of the Zeeman and Coulomb interactions, which provides clear spectral signatures of this effect for highly symmetric quantum dots. We uncover a large anisotropy of the Zeeman doublet splittings for longitudinal and transverse magnetic fields, revealing the ubiquitous role of a symmetry elevation in our pyramidal quantum dots. These results suggest that the common description of the Zeeman effect based on effective g factors for electrons and holes must be revised when dealing with exciton complexes.

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Polarization-entangled photons produced with high-symmetry site-controlled quantum dots

Cited by 171 publications

References 33 publications

Spin–orbit coupling in surface plasmon scattering by nanostructures

Spin–orbit coupling in surface plasmon scattering by nanostructures

Statistical properties of exciton fine structure splitting and polarization angles in quantum dot ensembles

Intertwining of Zeeman and Coulomb interactions on excitons in highly symmetric semiconductor quantum dots

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