Optical initialization, readout, and dynamics of a Mn spin in a quantum dot

Gall, Claire Le; Kolodka, R. S.; Cao, Chong Long; Boukari, H.; Mariette, H.; Fernández-Rossier, J.; Besombes, L.

doi:10.1103/physrevb.81.245315

Cited by 54 publications

(112 citation statements)

References 27 publications

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“…Even in a QD including certain charges, the Mn atom relaxes in a time scale of about 100 ns. 38 As shown in section III and IV, manipulation time of the system is about 50 ns for a characteristic time of the electron tunneling, Γ −1 ∼ 1ns. Furthermore, there is still a space for reducing the manipulation time of the system.…”

Section: Discussionmentioning

confidence: 99%

Coherent manipulation of a single magnetic atom using polarized single electron transport in a double quantum dot

Lai

Yang

2015

Phys. Rev. B

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We consider theoretically a magnetic impurity spin driven by polarized electrons tunneling through a double quantum dot system. Spin blockade effect and spin conservation in the system make the magnetic impurity sufficiently interact with each transferring electron. As a results, a single collected electron carries information about spin change of the magnetic impurity. The scheme may develop all electrical manipulation of magnetic atoms by means of single electrons, which is significant for the implementation of scalable logical gates in information processing systems.

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Section: Discussionmentioning

confidence: 99%

Coherent manipulation of a single magnetic atom using polarized single electron transport in a double quantum dot

Lai

Yang

2015

Phys. Rev. B

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“…A Mn atom in a strained self-assembled CdTe QD exhibits a fine structure dominated by a weak magnetic anisotropy with an easy axis along the QD axis [28][29][30] . Neglecting the tetrahedral crystal field of the CdTe matrix 31,32 , this fine structure is described by the effective spin Hamiltonian…”

Section: Spin Structure Of a Positively Charged Mn-doped Quantummentioning

confidence: 99%

“…Individual QDs containing one Mn are isolated using micro-spectroscopy techniques 28 . A high refractive index hemispherical solid immersion lens is mounted on the surface of the sample to enhance the spatial resolution and the collection efficiency of single dot emission.…”

Section: Sample and Experimentsmentioning

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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“…The Mn also exhibits a fine structure dominated by a magnetic anisotropy with an easy axis along the QD axis 9,17 . Neglecting the small tetrahedral crystal field 15,16 , this fine structure is described by the spin Hamiltonian…”

mentioning

confidence: 99%

“…A positive bias voltage is applied between a 6 nm thick gold semi-transparent Schottcky gate deposited on the surface of the sample and the substrate in order to trap a hole in the QD 7 . Individual QDs containing one Mn are isolated using micro-spectroscopy techniques 9 .…”

mentioning

confidence: 99%

Strain-induced coherent dynamics of coupled carriers and Mn spins in a quantum dot

2015

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We report on the coherent dynamics of the spin of an individual magnetic atom coupled to carriers in a semiconductor quantum dot which has been investigated by resonant photoluminescence of the positively charged exciton (X + ). We demonstrate that a positively charged CdTe/ZnTe quantum dot doped with a single Mn atom forms an ensemble of optical Λ systems which can be addressed independently. We show that the spin dynamics of the X + -Mn complex is dominated by the electronMn exchange interaction and report on the coherent dynamics of the electron-Mn spin system that is directly observed in the time domain. Quantum beats reflecting the coherent transfer of population between electron-Mn spin states, which are mixed by an anisotropic strain in the plane of the quantum dot, are clearly observed. We finally highlight that this strain induced coherent coupling is tunable with an external magnetic field.Semiconductor quantum dots (QDs) are solid-state systems which permit efficient manipulation of single charge and spin. The optical properties of a QD can be used to control the spin state of carriers, nuclei as well as individual 1-4 or pairs 5,6 of magnetic atoms. The spin of one 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. The insertion of a magnetic atom in a QD where the charge and strain states can be controlled offers additional degrees of freedom to tune the properties of the localized spin. Development of information processing using the spin of magnetic atoms in semiconductors will require tuning the coherent coupling between two or more spins. Controlling the exchange coupling of magnetic atoms with the spin of a carrier is an attractive approach to coherently transfer information between the atomic localized spins.Here we report on the coherent dynamics of the spin of a magnetic atom coupled to the spin of individual carriers. This dynamics has been investigated by resonant photoluminescence (PL) of the positively charged exciton (X + ) coupled to a single Mn in a p-doped CdTe/ZnTe QD 7 . We have analysed the spin dynamics of the X + -Mn complex under resonant excitation and show that it is controlled by the electron-Mn (e-Mn) interaction. We demonstrate that a positively charged Mn-doped QD forms optical Λ systems that can be addressed with resonant lasers. We show that the coherent dynamics of the coupled electron and Mn spins is extremely sensitive to the local strain at the Mn location. Oscillations in the circular polarization rate of the resonant PL reveal quantum beats between e-Mn spin states mixed by an anisotropic strain in the plane of the QD. This coherent coupling, characterized by a change in the angular momentum ∆S z = ±2, can be tuned by a magnetic field.The sample consist of Mn-doped CdTe QDs grown by molecular beam epitaxy on a p-doped ZnTe(001) substrate 8 . A positive bias voltage is applied between a 6 nm thick gold semi-transparent Schottcky gate deposi...

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Optical initialization, readout, and dynamics of a Mn spin in a quantum dot

Cited by 54 publications

References 27 publications

Coherent manipulation of a single magnetic atom using polarized single electron transport in a double quantum dot

Coherent manipulation of a single magnetic atom using polarized single electron transport in a double quantum dot

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

Strain-induced coherent dynamics of coupled carriers and Mn spins in a quantum dot

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