Optical control of the spin state of two Mn atoms in a quantum dot

Besombes, L.; Cao, Chong Long; Jamet, Ségolène; Boukari, H.; Fernández-Rossier, J.

doi:10.1103/physrevb.86.165306

Cited by 37 publications

(33 citation statements)

References 31 publications

(89 reference statements)

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“…Semiconductor quantum dots (QDs) permit efficient electrical or optical manipulation of individual carrier spins [6][7][8][9] . It has been shown that the optical properties of a QD can also be used to control the spin state of individual [10][11][12][13][14][15] or pairs 16,17 of magnetic atoms. The spin of a magnetic atom in a QD can be prepared by the injection of spin polarized carriers and its state can be read through the energy and polarization of the photons emitted by the QD [18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

Resonant photoluminescence and dynamics of a hybrid Mn hole spin in a positively charged magnetic quantum dot

2017

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We analyze, through resonant photoluminescence, the spin dynamics of an individual magnetic atom (Mn) coupled to a hole in a semiconductor quantum dot. The hybrid Mn-hole spin and the positively charged exciton in a CdTe/ZnTe quantum dot forms an ensemble of Λ systems which can be addressed optically. Auto-correlation of the resonant photoluminescence and resonant optical pumping experiments are used to study the spin relaxation channels in this multilevel spin system. We identified for the hybrid Mn-hole spin an efficient relaxation channel driven by the interplay of the Mn-hole exchange interaction and the coupling to acoustic phonons. We also show that the optical Λ systems are connected through inefficient spin-flips than can be enhanced under weak transverse magnetic field. The dynamics of the resonant photoluminescence in a p-doped magnetic quantum dot is well described by a complete rate equation model. Our results suggest that long lived hybrid Mn-hole spin could be obtained in quantum dot systems with large heavy-hole/light-hole splitting.

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Section: Introductionmentioning

confidence: 99%

Resonant photoluminescence and dynamics of a hybrid Mn hole spin in a positively charged magnetic quantum dot

2017

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“…The Autler-Townes effect in the fine structure of a neutral or charged QD [9,10], the Mollow absorption spectrum of an individual QD [11] and the emission of an optically dressed exciton and biexciton complex [12] have been reported. Exploiting these optical properties of QDs, it has been demonstrated during the last years the possibility to optically probe and control the spin of individual or pairs of Manganese (Mn) atoms both in II-VI [13,14] and III-V [15][16][17] DMS. Recently, other magnetic elements, like Co, have also been successfully incorporated in II-VI semiconductor QDs [18].…”

Section: Introductionmentioning

confidence: 99%

Optical control of the spin of a magnetic atom in a semiconductor quantum dot

et al. 2015

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Abstract:The control of single spins in solids is a key but challenging step for any spin-based solid-state quantumcomputing device. Thanks to their expected long coherence time, localized spins on magnetic atoms in a semiconductor host could be an interesting media to store quantum information in the solid state. Optical probing and control of the spin of individual or pairs of Manganese (Mn) atoms (S = 5/2) have been obtained in II-VI and III-V semiconductor quantum dots during the last years. In this paper, we review recently developed optical control experiments of the spin of an individual Mn atoms in II-VI semiconductor self-assembled or strain-free quantum dots (QDs). We first show that the fine structure of the Mn atom and especially a strained induced magnetic anisotropy is the main parameter controlling the spin memory of the magnetic atom at zero magnetic field. We then demonstrate that the energy of any spin state of a Mn atom or pairs of Mn atom can be independently tuned by using the optical Stark effect induced by a resonant laser field. The strong coupling with the resonant laser field modifies the Mn fine structure and consequently its dynamics. We then describe the spin dynamics of a Mn atom under this strong resonant optical excitation. In addition to standard optical pumping expected for a resonant excitation, we show that the Mn spin population can be trapped in the state which is resonantly excited. This effect is modeled considering the coherent spin dynamics of the coupled electronic and nuclear spin of the Mn atom optically dressed by a resonant laser field. Finally, we discuss the spin dynamics of a Mn atom in strain-free QDs and show that these structures should permit a fast optical coherent control of an individual Mn spin.

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“…Semiconductor quantum dots (QDs) doped by a single or few magnetic impurities have been studied in the last decade in order to investigate the exchange interaction between spin carriers in the quantum regime 1-9 , and the potential of such system as a solid-state quantum bit [10][11][12][13][14][15][16][17][18][19] . In such QDs the dominant 2-spin interaction is the exchange interaction between the magnetic dopant and the QD-confined hole (up to a few meV).…”

Section: Introductionmentioning

confidence: 99%

Exchange interaction-driven dynamic nuclear polarization in Mn-doped InGaAs/GaAs quantum dots

2016

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We investigated optical spin orientation and dynamic nuclear polarization (DNP) in individual self-assembled InGaAs/GaAs quantum dots (QDs) doped by a single Mn atom, a magnetic impurity providing a neutral acceptor A 0 with an effective spin J = 1. We find that the spin of an electron photo-created in such a quantum dot can be efficiently oriented by a quasi-resonant circularlypolarized excitation. For the electron spin levels which are made quasi-degenerate by a magnetic field compensating the exchange interaction ∆e with A 0 , there is however a full depolarization due the anisotropic part of the exchange. Still, in most studied QDs, the spin polarized photo-electrons give rise to a pronounced DNP which grows with a longitudinal magnetic field until a critical field where it abruptly vanishes. For some QDs, several replica of such DNP sequence are observed at different magnetic fields. This striking behavior is qualitatively discussed as a consequence of different exchange interactions experienced by the electron, driving the DNP rate via the energy cost of electron-nucleus spin flip-flops.

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Optical control of the spin state of two Mn atoms in a quantum dot

Cited by 37 publications

References 31 publications

Resonant photoluminescence and dynamics of a hybrid Mn hole spin in a positively charged magnetic quantum dot

Resonant photoluminescence and dynamics of a hybrid Mn hole spin in a positively charged magnetic quantum dot

Optical control of the spin of a magnetic atom in a semiconductor quantum dot

Exchange interaction-driven dynamic nuclear polarization in Mn-doped InGaAs/GaAs quantum dots

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