Temperature of a Single Mn Atom in a CdTe Quantum Dot

Papierska, J.; Goryca, M.; Wojnar, P.; Kossacki, P.

doi:10.12693/aphyspola.116.899

Cited by 2 publications

(3 citation statements)

References 6 publications

(8 reference statements)

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“…where I S=±2 denotes the intensity of the line(s) related to a S = ±2 spin of the Fe 2+ ion in a given circular polarisation that defines the spin of exciton. Such a method was applied to the case of neutral exciton [11,12,25], charged exciton [26], and biexciton transition [11]. It was identified that the last case is the most reliable, as the biexciton due to its singlet nature it is not affected by the issue of exciton spin relaxation [11].…”

Section: Paradox Of Simplified Determination Of the Ion Orientationmentioning

confidence: 99%

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Readout of a dopant spin in the anisotropic quantum dot with a single magnetic ion

Rodek

Kazimierczuk

Bogucki

et al. 2019

J. Phys.: Condens. Matter

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Owing to exchange interaction between the exciton and magnetic ion, a quantum dot embedding a single magnetic ion is a great platform for optical control of individual spin. In particular, a quantum dot provides strong and sharp optical transitions, which give experimental access to spin states of an individual magnetic ion. We show, however, that physics of quantum dot excitons also complicate spin readout and optical spin manipulation in such a system. This is due to electron-hole exchange interaction in anisotropic quantum dots, which affects the polarization of the emission lines. One of the consequences is that the intensity of spectral lines in a single spectrum are not simply proportional to the population of various spin states of magnetic ion. In order to provide a solution of the above problem, we present a method of extracting both the spin polarisation degree of a neutral exciton and magnetic dopant inside a semiconductor quantum dot in an external magnetic field. Our approach is experimentally verified on a system of CdSe/ZnSe quantum dot containing a single Fe 2+ ion. Both the resonant and non-resonant excitation regimes are explored resulting in a record high optical orientation efficiency of dopant spin in the former case. The proposed solutions can be easily expanded to any other system of quantum dots containing magnetic dopants.

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Section: Paradox Of Simplified Determination Of the Ion Orientationmentioning

confidence: 99%

“…The described correspondence is a foundation of a go-to method of measuring the orientation of the dopant spin η Fe simply by taking a normalised difference in the intensities of lower and higher energy emission peaks [12,25,26]:…”

Section: Paradox Of Simplified Determination Of the Ion Orientationmentioning

confidence: 99%

Readout of a dopant spin in the anisotropic quantum dot with a single magnetic ion

Rodek

Kazimierczuk

Bogucki

et al. 2019

J. Phys.: Condens. Matter

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show abstract

“…Moreover, any heating mechanism should be strongly dependent on the excitation power. For example, in the case of QDs with single Mn 2+ ions, the heating of the ion spin by the laser excitation is known to be very efficient with the corresponding effective temperatures of the Mn 2+ ion reaching tens of K for sufficiently high excitation powers 1,7,8,32 . Here, we do not observe any significant change in the nature of the transformation by varying the laser excitation power by two orders of magnitude, as shown in Fig.…”

Section: Magneto-luminescence Studiesmentioning

confidence: 99%

Magnetic-field-induced abrupt spin-state transition in a quantum dot containing magnetic ions

et al. 2016

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We present the results of a comprehensive magneto-optical characterization of single CdTe quantum dots containing a few Mn 2+ ions. We find that some quantum dots exhibit an unexpected evolution of excitonic photoluminescence spectrum with the magnetic field. At a certain value of the magnetic field, specific for every quantum dot, each of the broad spectral lines related to the recombination of various excitonic complexes confined inside the dot transforms into a pair of narrow lines split by several meV. We interpret this abrupt change in the character of excitonic emission spectrum as a consequence of a transition from a non-polarized state of the Mn 2+ spins in a low field regime to a highly (almost fully) polarized state above the critical magnetic field. Various optical experiments, including polarization-resolved studies, investigation of different excitation regimes and time-resolved measurements corroborate this scenario. However, these measurements indicate also that the observed effect is not related or influenced by the photo-created charge carriers, but it is rather originating from unusual spin configuration in the cluster of Mn 2+ ions.

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Temperature of a Single Mn Atom in a CdTe Quantum Dot

Cited by 2 publications

References 6 publications

Readout of a dopant spin in the anisotropic quantum dot with a single magnetic ion

Readout of a dopant spin in the anisotropic quantum dot with a single magnetic ion

Magnetic-field-induced abrupt spin-state transition in a quantum dot containing magnetic ions

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