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

Lafuente-Sampietro, Alban; Boukari, H.; Besombes, L.

doi:10.1103/physrevb.95.245308

Cited by 8 publications

(2 citation statements)

References 55 publications

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“…The spin-lattice coupling coefficient G 11 value obtained in this work diverges from previously reported in ref. Our findings could be especially useful in all studies involving spin-related phenomena in CdTe-based MBEgrown nanostructures and devices including multiple-QWs and quantum dots [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] .…”

Section: Introductionmentioning

confidence: 90%

Angle-resolved optically detected magnetic resonance as a tool for strain determination in nanostructures

Bogucki,

Goryca,

Łopion

et al. 2021

Preprint

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In this paper, we apply the angle-resolved Optically Detected Magnetic Resonance (ODMR) technique to study series of strained (Cd, Mn)Te/(Cd, Mg)Te quantum wells (QWs) produced by molecular beam epitaxy. By analyzing characteristic features of ODMR angular scans, we determine strain-induced axial-symmetry spin Hamiltonian parameter D with neV precision. Furthermore, we use low-temperature optical reflectivity measurements and X-ray diffraction scans to evaluate the local strain present in QW material. In our analysis, we take into account different thermal expansion coefficients of GaAs substrate and CdTe buffer. The additional deformation due to the thermal expansion effects has the same magnitude as deformation origination from the different compositions of the samples. Based on the evaluated deformations and values of strain-induced axialsymmetry spin Hamiltonian parameter D, we find strain spin-lattice coefficient G11 = (72.2 ± 1.9) neV for Mn 2+ in CdTe and shear deformation potential b = (−0.94 ± 0.11) eV for CdTe.

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Section: Introductionmentioning

confidence: 90%

Angle-resolved optically detected magnetic resonance as a tool for strain determination in nanostructures

Bogucki,

Goryca,

Łopion

et al. 2021

Preprint

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“…The time-scale of the hole-Cr flip-flops in a Cr-doped QD induced by the interaction with the continuum of bulk acoustic phonons can be estimated using the Fermi golden rule. The spin-flip process that we consider here is based on the interplay of the hole-magnetic atom exchange interaction and the interaction with the strain field of acoustic phonons [52]. Similar models, combining exchange interaction and coupling with acoustic phonons, where developed to explain the exciton spin relaxation in QDs [46,47].…”

Section: Phonon Induced Hole-cr Flip-flopsmentioning

confidence: 99%

Optical control of an individual Cr spin in a semiconductor quantum dot

Besombes¹,

Boukari²,

Tiwari³

et al. 2019

Semicond. Sci. Technol.

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Individual localized spins in semiconductors are attracting significant interest in the frame of quantum technologies including quantum information and quantum enhanced sensing. Localized spins of magnetic atoms incorporated in a semiconductor are particularly promising for quantum sensing. Here we demonstrate that the spin of a Cr atom in a quantum dot (QD) can be controlled optically and we discuss the main properties of this single spin system. The photoluminescence of individual Cr-doped QDs and their evolution in magnetic field reveal a large magnetic anisotropy of the Cr spin induced by local strain. This results in a splitting of the Cr spin states and in a thermalization on the lower energy states states S z =0 and S z =±1. The magneto-optical properties of Cr-doped QDs can be modelled by an effective spin Hamiltonian including the spin to strain coupling and the influence of the QD symmetry. We also show that a single Cr spin can be prepared by resonant optical pumping. Monitoring the intensity of the resonant fluorescence of the QD during this process permits to probe the dynamics of the optical initialization of the spin.Hole-Cr flip-flops induced by an interplay of the hole-Cr exchange interaction and the coupling with acoustic phonons are the main source of relaxation that explains the efficient resonant optical pumping. The Cr spin relaxation time is measured in the µs range. We evidence that a Cr spin couples to non-equilibrium acoustic phonons generated during the optical excitation inside or near the QD). Finally we show that the energy of any spin state of an individual Cr atom can be independently tuned by a resonant single mode laser through the optical Stark effect. All these properties make Cr-doped QDs very promising for the development of hybrid spin-mechanical systems where a coherent mechanical driving of an individual spin in an oscillator is required. arXiv:1911.08572v1 [cond-mat.mes-hall]

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