Optical probing of spin fluctuations of a single paramagnetic Mn atom in a semiconductor quantum dot

Besombes, L.; Léger, Yoan; Bernos, Julien; Boukari, H.; Mariette, H.; Poizat, Jean‐Philippe; Clement, T.; Fernández-Rossier, J.; Aguado, Ramón

doi:10.1103/physrevb.78.125324

Cited by 55 publications

(63 citation statements)

References 33 publications

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“…They demonstrated an efficient optical read-out of the Mn spin state [8]. Furthermore, the dynamics of this state has been studied in photon correlation experiments [11], revealing an important influence of photo-created carriers on Mn spin relaxation. The writing and storing of the information in the Mn spin state has received less attention so far.…”

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confidence: 99%

Optical Manipulation of a Single Mn Spin in a CdTe-Based Quantum Dot

et al. 2009

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A system of two coupled CdTe quantum dots, one of them containing a single Mn ion, was studied in continuous wave and modulated photoluminescence, photoluminescence excitation, and photon correlation experiments. Optical writing of information in the spin state of the Mn ion has been demonstrated, using orientation of the Mn spin by spin-polarized carriers transferred from the neighbor quantum dot. Mn spin orientation time values from 20 ns to 100 ns were measured, depending on the excitation power. Storage time of the information in the Mn spin was found to be enhanced by application of a static magnetic field of 1 T, reaching hundreds of microseconds in the dark. Simple rate equation models were found to describe correctly static and dynamical properties of the system.One of important research directions that may influence the future of information processing, especially of spintronics [1], is focused on physical phenomena occurring in nanoscale-size quantum objects. One of such objects, close to the ultimate limit of information storage miniaturization, is a single Mn atom in a semiconductor quantum dot (QD) [2,3]. After intensive studies of semimagnetic QD containing many magnetic ions [4,5,6,7], single Mn atoms in CdTe [8] and InAs [9] QDs have been observed in photoluminescence (PL) experiments. Many experiments supplied substantial knowledge on physical properties of single Mn atoms, especially in CdTe QDs. In particular, they revealed a strong influence of the position of the Mn atom in the QD, reflecting the symmetry of the system [10]. They demonstrated an efficient optical read-out of the Mn spin state [8]. Furthermore, the dynamics of this state has been studied in photon correlation experiments [11], revealing an important influence of photo-created carriers on Mn spin relaxation. The writing and storing of the information in the Mn spin state has received less attention so far. These issues represent the focus of the present work.In particular, we demonstrate optical writing of information in the spin state of a single Mn ion and we test the stability of this state in the time range up to 0.2 ms.CdTe QDs containing single Mn ions were grown by molecular beam epitaxy. A single layer of self-assembled QDs was deposited in a ZnTe matrix. Manganese was added by briefly opening the Mn effusion cell during the growth of the CdTe layer [12]. The opening time and the Mn flux were adjusted to achieve a large probability of growth of QDs with a single Mn ion in each dot. The selection of single QDs was done by spatial limitation of PL excitation and detection to an area smaller than 0.5 micrometer in diameter, with microscope objective immersed in pumped liquid helium. Continuous wave excitation was used either above the ZnTe barrier gap (at 457 nm) or by a tunable dye laser in the range 570 -600 nm. Well separated photoluminescence lines from individual QDs were observed in the low energy part of the PL spectrum. We were able to select numerous lines showing a PL pattern characteristic for the presence of a...

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Optical Manipulation of a Single Mn Spin in a CdTe-Based Quantum Dot

et al. 2009

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“…As the emission of the biexciton is shifted by 10 to 14 meV below the resonant excitation on the X-Mn levels, it can be easily separated from the scattered photons of the CW pumping laser. The resonant two-photon absorption scheme used here also avoids the injection of free carriers in the vicinity of the QD and consequently limits the spin relaxation of the Mn by exchange coupling with these free carriers 21 . Let us note however that the cascade recombination of the biexciton leaves in the QD a maximum of one exciton every 13 ns (repetition rate of the pulsed excitation).…”

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confidence: 99%

“…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 in a low-temperature (T =5K) scanning optical microscope 21 .…”

Section: Two-photon Readout Of the Spin State Of An Individual Mnmentioning

confidence: 99%

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

2013

Self Cite

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We analyze the spin dynamics of an individual magnetic atom (Mn) inserted in a II-VI semiconductor quantum dot under resonant optical excitation. In addition to standard optical pumping expected for a resonant excitation, we show that for particular conditions of laser detuning and excitation intensity, the 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. This spin population trapping mechanism is controlled by the combined effect of the coupling with the laser field and the coherent interaction between the different Mn spin states induced by an anisotropy of the strain in the plane of the quantum dot.

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“…The resonant two-photon absorption scheme used here also avoids the injection of free carriers in the vicinity of the QD and consequently limits the spin relaxation of the Mn by exchange coupling with these free carriers. 21 Let us note however that the cascade recombination of the biexciton leaves in the QD a maximum of one exciton every . The resonant creation of the biexciton (X 2 -Mn) is only possible for a linearly polarized excitation (red) whereas almost no photoluminescence is observed for circularly polarized pulses (black).…”

Section: Two-photon Readout Of the Spin State Of An Individual Mnmentioning

confidence: 99%

“…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 in a low-temperature (T = 5 K) scanning optical microscope. 21 In order to observe the population repartition 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. The principle of this experiment is presented in Fig.…”

Section: Two-photon Readout Of the Spin State Of An Individual Mnmentioning

confidence: 99%

Winning at Quantum Dice

Urbaszek¹,

Kunold²

2013

Physics

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We analyze the spin dynamics of an individual magnetic atom (Mn) inserted in a II-VI semiconductor quantum dot under resonant optical excitation. In addition to standard optical pumping expected for a resonant excitation, we show that for particular conditions of laser detuning and excitation intensity, 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. This "spin population trapping" mechanism is controlled by the combined effect of the coupling with the laser field and the coherent interaction between the different Mn spin states induced by an anisotropy of the strain in the plane of the quantum dot.

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Optical probing of spin fluctuations of a single paramagnetic Mn atom in a semiconductor quantum dot

Cited by 55 publications

References 33 publications

Optical Manipulation of a Single Mn Spin in a CdTe-Based Quantum Dot

Optical Manipulation of a Single Mn Spin in a CdTe-Based Quantum Dot

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

Winning at Quantum Dice

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