Resonant optical alignment and orientation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mtext>Mn</mml:mtext><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>spins in CdMnTe crystals

Baryshnikov, K. A.; Langer, L.; Акимов, И. А.; Korenev, V. L.; Kusrayev, Yu. G.; Averkiev, N. S.; Yakovlev, D. R.; Bayer, М.

doi:10.1103/physrevb.92.205202

Cited by 8 publications

(16 citation statements)

References 21 publications

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“…The incorporation of magnetic Mn ions (spin S = 5/2) into II–VI semiconductor QDs leads to enhanced magneto-optical properties typical of DMS materials. − These properties arise from strong sp-d exchange interactions between QD excitons and magnetic spins of Mn impurities. One manifestation of these interactions is a large enhancement of the Zeeman splitting of the QD electronic states by the applied magnetic field ( B ) which leads to “giant” effective exciton g -factors ( g eff ). ,,, This phenomenon can be ascribed to the effect of field-aligned Mn spins which lead to the increase in the effective magnetic field acting on a QD exciton.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The incorporation of paramagnetic, spin-5/2 manganese (Mn) impurities into II–VI colloidal quantum dots (QDs) results in considerable modifications of their optical and magneto-optical properties. − In particular, strong sp-d exchange interactions between a semiconductor host and magnetic impurities lead to fast excitation transfer from the QD to the Mn ions, which enables highly efficient emission in the intragap region due to radiative relaxation of the excited Mn state. ,,− This process has been exploited for color conversion in light emitting devices − and sunlight harvesting in luminescent solar concentrators. , The spin-exchange Auger-type energy transfer from the excited Mn ions to QD excitons is also extremely fast (subpicosecond time scales), which allows one to manipulate nonequilibrium “hot” unrelaxed carriers and produce efficient photoemission with weak continuous wave optical excitation. − Further, strong spin-exchange interactions between intrinsic excitonic states and embedded Mn spins have a profound effect on QD magneto-optical behaviors. In particular, the alignment of isolated (paramagnetic) Mn spins by an external magnetic field enhances the overall effective magnetic field that is “seen” by band electrons and holes in the host QD.…”

Section: Introductionmentioning

confidence: 99%

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Exploiting Functional Impurities for Fast and Efficient Incorporation of Manganese into Quantum Dots

et al. 2020

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The incorporation of manganese (Mn) ions into Cd(Zn)-chalcogenide QDs activates strong spin-exchange interactions between the magnetic ions and intrinsic QD excitons that have been exploited for color conversion, sunlight harvesting, electron photoemission, and advanced imaging and sensing. The ability to take full advantage of novel functionalities enabled by Mn dopants requires accurate control of doping levels over a wide range of Mn contents. This, however, still represents a considerable challenge. Specific problems include the difficulty in obtaining high Mn contents, considerable broadening of QD size dispersion during the doping procedure, and large batch-to-batch variations in the amount of incorporated Mn. Here, we show that these problems originate from the presence of unreacted cadmium (Cd) complexes whose abundance is linked to uncontrolled impurities participating in the QD synthesis. After identifying these impurities as secondary phosphines, we modify the synthesis by introducing controlled amounts of “functional” secondary phosphine species. This allows us to realize a regime of nearly ideal QD doping when incorporation of magnetic ions occurs solely via addition of Mn–Se units without uncontrolled deposition of Cd–Se species. Using this method, we achieve very high per-dot Mn contents (>30% of all cations) and thereby realize exceptionally strong exciton-Mn exchange coupling with g-factors of ∼600.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exploiting Functional Impurities for Fast and Efficient Incorporation of Manganese into Quantum Dots

et al. 2020

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“…QDs are suitable for optical control of the spin alignment because the quantum confinement effect to electrons and holes causes the suppression of their spin dephasing. Recently, the spin alignment of the Mn ions produced by light was reported by observing the PL arising from their d-d transitions [12,13].…”

Section: Introductionmentioning

confidence: 99%

Propagation effect on photoluminescence of spin-aligned high-density exciton magnetic polarons in Cd 0.8 Mn 0.2 Te

Nagata

Hirase

Miyajima

2017

Journal of Luminescence

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“…This makes them an attractive research target for efforts that seek to broaden the range of material platforms and functionality available to defect spins in quantum information applications. Recent explorations suggest potential roles as single photon emitters [23][24][25], spin-based qubits [26][27][28][29], and as a storage media for hybrid quantum systems [30].…”

Section: Introductionmentioning

confidence: 99%

Resonant optical spectroscopy and coherent control ofCr4+spin ensembles in SiC and GaN

et al. 2017

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Spins bound to point defects are increasingly viewed as an important resource for solid-state implementations of quantum information and spintronic technologies. In particular, there is a growing interest in the identification of new classes of defect spin that can be controlled optically. Here, we demonstrate ensemble optical spin polarization and optically detected magnetic resonance (ODMR) of the S = 1 electronic ground state of chromium (Cr 4+ ) impurities in silicon carbide (SiC) and gallium nitride (GaN). Spin polarization is made possible by the narrow optical linewidths of these ensembles (<8.5 GHz), which are similar in magnitude to the ground state zero-field spin splitting energies of the ions at liquid helium temperatures. This allows us to optically resolve individual spin sublevels within the ensembles at low magnetic fields using resonant excitation from a cavity-stabilized, narrow-linewidth laser. Additionally, these near-infrared emitters possess exceptionally weak phonon sidebands, ensuring that >73% of the overall optical emission is contained with the defects' zero-phonon lines. These characteristics make this semiconductor-based, transition metal impurity system a promising target for further study in the ongoing effort to integrate optically active quantum states within common optoelectronic materials.

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Resonant optical alignment and orientation ofMn2+spins in CdMnTe crystals

Cited by 8 publications

References 21 publications

Exploiting Functional Impurities for Fast and Efficient Incorporation of Manganese into Quantum Dots

Exploiting Functional Impurities for Fast and Efficient Incorporation of Manganese into Quantum Dots

Propagation effect on photoluminescence of spin-aligned high-density exciton magnetic polarons in Cd 0.8 Mn 0.2 Te

Resonant optical spectroscopy and coherent control ofCr4+spin ensembles in SiC and GaN

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