Optical Spin Orientation of a Single Manganese Atom in a Semiconductor Quantum Dot Using Quasiresonant Photoexcitation

Gall, Claire Le; Besombes, L.; Boukari, H.; Kolodka, R. S.; Cibert, J.; Mariette, H.

doi:10.1103/physrevlett.102.127402

Cited by 143 publications

(192 citation statements)

References 18 publications

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“…τ i > τ s . As mentioned in the introduction, a single Mn spin relaxation time from 1 µs to 0.4 ms in CdTe QD 10,13 , and electron life time from 50 ns to 1 µs in II-VI semiconductor systems are reported. Even in a QD including certain charges, the Mn atom relaxes in a time scale of about 100 ns.…”

Section: Discussionmentioning

confidence: 99%

“…12 Third, Magnetic atom such as Mn impurity with relaxation time from 1 µs to 0.4 ms was observed in experiment. 10,13 The time is longer than driving time of the magnetic atom, which will be shown later in the present work. Forth, the technique for real time detection of single electron tunneling has been well developed recently.…”

Section: Introductionmentioning

confidence: 91%

“…It is comparable to the time scale of a previously reported optical control. 13 Since each electron contributes to the spin change of the magnetic atom with momentum , the magnetic atom initialized in the states |ψ M (0) = | − 5/2 , | − 3/2 , | − 1/2 , |1/2 , |3/2 , |5/2 leads to finite electrons collected in the right lead with definite numbers n ↓ = 5, 4, 3, 2, 1, 0, respectively. It can be seen in Fig.…”

Section: Manipulation Of a Magnetic Atom With Spin M=5/2mentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 91%

Section: Manipulation Of a Magnetic Atom With Spin M=5/2mentioning

confidence: 99%

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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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“…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%

“…D 0 varies from 0 µeV for a strain free QD 14 to 12 µeV for a fully strained CdTe layer matched on a ZnTe substrate 17 . These crystal field terms do not affect the PL spectra as they are present both in the excited (X + -Mn) and ground (h-Mn) states.…”

mentioning

confidence: 99%

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

2015

Self Cite

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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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Optically detected magnetic resonance in CdMnSe/ZnSe submonolayer quantum wells

Tolmachev

Babunts

Romanov

et al. 2010

Physica Status Solidi (b)

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Fine structure of isolated Mn 2þ ions in CdMnSe/ZnSe quantum wells (QWs) is revealed by optically detected magnetic resonance (ODMR) recorded by monitoring both exciton emission and intra-Mn luminescence in the presence of simultaneous microwave irradiation. A large decrease of photoluminescence (PL) intensity of excitons and an increase of PL intensity of Mn 2þ ions is observed when an applied magnetic field satisfies the Mn 2þ electron paramagnetic resonance (EPR) condition. This suggests that a spin-dependent energy transfer from excitons to intra-Mn excitations occurs at the EPR condition.

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Optical Spin Orientation of a Single Manganese Atom in a Semiconductor Quantum Dot Using Quasiresonant Photoexcitation

Cited by 143 publications

References 18 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

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

Optically detected magnetic resonance in CdMnSe/ZnSe submonolayer quantum wells

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