Spin dynamics of a Mn atom in a semiconductor quantum dot under resonant optical excitation

Jamet, Ségolène; Boukari, H.; Besombes, L.

doi:10.1103/physrevb.87.245306

Cited by 18 publications

(23 citation statements)

References 31 publications

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“…In (22), L̺ describes the coupling or decay channels resulting from an interaction with the environment 35,48,49 . The population transfers from level j to level i in an irreversible process associated with a coupling to a reservoir is described by a Lindblad term of the form L inc,j→i ̺ = Γ j→i 2 (2|i j|̺|j i| − ̺|j j| − |j j|̺) (25) where Γ j→i is the incoherent relaxation rate from level j to level i.…”

Section: Model Of the Carrier-mn Spin Dynamics Under Resonant Exmentioning

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: Model Of the Carrier-mn Spin Dynamics Under Resonant Exmentioning

confidence: 99%

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

2017

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“…In order to observe the population distribution on the spin states of the Mn under resonant optical excitation on a given X-Mn level, we developed a technique allowing probing simultaneously the six spin states in the resonant optical excitation regime [44]. The principle of this experiment is presented in Fig.…”

Section: Spin Dynamics Of An Optically Dressed Mn Atommentioning

confidence: 99%

“…The nuclear spin relaxation is considered to be longer than the timescale of all the other spin relaxation mechanism discussed here. To describe the magnetic field dependence of the resonant PL, we extend the model presented in the previous section [44]. Under σ− excitation on the high energy line, the exciton states |Xz = −1, Sz = −5/2, Iz⟩ are laser coupled to the Mn states |Sz = −5/2, Iz⟩.…”

Section: Resonant Optical Pumping Of a Mn Spin In A Strain-free Quantmentioning

confidence: 99%

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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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“…Such energy shift could be exploited to control the coherent dynamics of the magnetic atom 16,31 . This optical control technique is presented in Fig.…”

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confidence: 99%

Resonant optical control of the spin of a single Cr atom in a quantum dot

et al. 2017

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A Cr atom in a semiconductor host carries a localized spin with an intrinsic large spin to strain coupling particularly promising for the development of hybrid spin-mechanical systems and coherent mechanical spin driving. We demonstrate here that the spin of an individual Cr atom inserted in a semiconductor quantum dot can be controlled optically. We first show that a Cr spin can be prepared by resonant optical pumping. Monitoring the time dependence of the intensity of the resonant fluorescence of the quantum dot during this process permits to probe the dynamics of the optical initialization of the Cr spin. Using this initialization and read-out technique we measured a Cr spin relaxation time at T=5 K of about 2 microseconds. We finally demonstrate that, under a resonant single mode laser field, the energy of any spin state of an individual Cr atom can be independently tuned by using the optical Stark effect.Individual spins in semiconductor nano-structures are promising for the development of quantum information technologies 1-3 . Spins trapped in optically active quantum dots (QDs) have attracted strong interest since their coupling to light enables fast spin control and optical coherent control has been demonstrated for electron 4,5 and hole 6,7 spins confined in QDs. Thanks to their expected longer coherence time, localized spins on individual dopants in semiconductors are also a promissing media for storing quantum information. Optically active QDs containing individual or pairs of magnetic dopants have been realized both in II-VI 8-12 and III-V 13,14 semiconductors. In these systems, since the confined carriers and magnetic atom spins become strongly mixed, an optical excitation of the QD can affect the spin state of the atom offering possibilities for a control of the localized spin 15,16 . The variety of magnetic transition elements that can be incorporated in semiconductors gives a large choice of localized electronic spins, nuclear spins and orbital momentums with optical addressability 8,[17][18][19] . This approach opens a diversity of applications in quantum information and quantum sensing.Among these magnetic atoms, chromium (Cr) is of particular interest 19 . It incorporates in II-VI semiconductors as Cr 2+ carrying an electronic spin S=2 and an orbital momentum L=2. Moreover, most of Cr isotopes have no nuclear spin. This simplifies the spin level structure and its coherent dynamics 20 . With bi-axial strain, the ground state of the Cr is an orbital singlet with spin degeneracy of 5. The orbital momentum of the Cr connects its spin to the local strain through the modification of the crystal field and the spin-orbit coupling. This spin to strain coupling is more than two orders of magnitude larger than for elements without orbital momentum (NV centers in diamond 21 , Mn atoms in II-VI semiconductors 22 ). Cr is therefore a promising qubit for hybrid spin-mechanical systems in which the motion of a mechanical oscillator would be coherently coupled to the spin state of a single atom 21,23,24 . The ...

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Spin dynamics of a Mn atom in a semiconductor quantum dot under resonant optical excitation

Cited by 18 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

Resonant optical control of the spin of a single Cr atom in a quantum dot

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