Spin relaxation in CdTe quantum dots with a single Mn atom

Petrović, Marko D.; Vukmirović, Nenad

doi:10.1103/physrevb.85.195311

Cited by 10 publications

(6 citation statements)

References 53 publications

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“…The dotted curve represents γ s calculated with the parameters of CdTe (E b = 10 meV, a B = 5.2 nm, δ e = 2π × 29 MHz) with n d = 10 14 cm −3 and γ D = 12µeV Å3 in the range of published values [35][36][37]. For this doping level one can distinguish the three different spin relaxation regimes.…”

Section: Interpretation and Discussionmentioning

confidence: 99%

Spatiotemporal electronic spin fluctuations in random nuclear fields in n-CdTe

Cronenberger,

Abbas,

Scalbert

et al. 2019

Preprint

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We report on the dynamics of electron spins in n-doped CdTe layers that differs significantly from the expected response derived from the studies dedicated to electron spin relaxation in n-GaAs. At zero magnetic field, the electron spin noise spectra exhibit a two-peak structure -a zero-frequency line and a satellite -that we attribute to the electron spin precession in a frozen random nuclear spin distribution. This implies a surprisingly long electron spin correlation time whatever the doping level, even above the Mott transition. Using spatiotemporal spin noise spectroscopy, we demonstrate that the observation of a satellite in the spin noise spectra and a fast spin diffusion are mutually exclusive. This is consistent with a shortening of the electron spin correlation time due to hopping between donors. We interpret our data via a model assuming that the low temperature spin relaxation is due to hopping between donors in presence of hyperfine and anisotropic exchange interactions. Most of our results can be interpreted in this framework. First, a transition from inhomogeneous to homogeneous broadening of the spin noise peaks and the disappearance of the satellite are observed when the hopping rate becomes larger than the Larmor period induced by the local nuclear fields. In the regime of homogeneous broadening the ratio between the spin diffusion constant and the spin relaxation rate has a value in good agreement with the Dresselhaus constant. In the regime of inhomogeneous broadening, most of the samples exhibit a broadening consistent with the distribution of local nuclear fields. We obtain a new estimate of the hyperfine constants in CdTe and a value of 0.10 Tesla for the maximum nuclear field. Finally, our study also reveals a puzzle as our samples behave as if the active donor concentration was reduced by several orders of magnitudes with respect to the nominal values.

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Section: Interpretation and Discussionmentioning

confidence: 99%

Spatiotemporal electronic spin fluctuations in random nuclear fields in n-CdTe

Cronenberger,

Abbas,

Scalbert

et al. 2019

Preprint

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“…[1][2][3] Recently, the electron transport properties of the QD doped with a single magnetic impurity/atom have attracted much attention because the electron spin in a QD can be strongly affected by the doped magnetic impurity. [4][5][6][7][8][9] For example, the position of the doped Mn atom within the CdTe QD and in the QD dimensions can change the spin relaxation time by up to one order of magnitude. 6 In fact, the electron transport through the QD system is essentially a quantum stochastic process, which leads to the quantum fluctuations of charge current.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7][8][9] For example, the position of the doped Mn atom within the CdTe QD and in the QD dimensions can change the spin relaxation time by up to one order of magnitude. 6 In fact, the electron transport through the QD system is essentially a quantum stochastic process, which leads to the quantum fluctuations of charge current. Therefore, the current noise properties of electron transport through the QD doped with a single magnetic impurity can allow one to identify the intrinsic properties of the QD system and access the information of electron correlation that cannot obtained from the average current.…”

Section: Introductionmentioning

confidence: 99%

Full counting statistics of a quantum dot doped with a single magnetic impurity

2013

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The full counting statistics of electron transport through a quantum dot (QD) doped with a single magnetic impurity weakly coupled to one ferromagnetic (F) and one normal-metal lead (N) is studied based on an efficient particle-number-resolved master equation. We demonstrate that the current noise properties depend sensitively on whether the source-electrode is the ferromagnetic lead and the type of exchange coupling between the conduction electron and magnetic impurity spin. For the F-QD-N system, namely, the ferromagnetic lead as source electrode and the normal-metal lead as drain one, the super-Poissonian noise in the anti-ferromagnetic coupling case can appear; whereas for the ferromagnetic coupling case the super-Poissonian noise does not appear. As for the N-QD-F system, the super-Poissonian noise in the ferromagnetic coupling case can appear in a relatively large bias voltage range; while for the anti-ferromagnetic coupling case, the super-Poissonian noise appears only in a relatively small bias voltage range. These super-Poissonian noise characteristics can be used to reveal the type of exchange coupling between the conduction electron and magnetic impurity spin, and can be qualitatively attributed to the spin-blockade mechanism and the effective competition between fast and slow transport channels. C 2013 Author(s)

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“…11 In a QD imbedded a magnetic atom, a longer life time of around 1 µs was predicted. 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.…”

Section: Introductionmentioning

confidence: 99%

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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Spin relaxation in CdTe quantum dots with a single Mn atom

Cited by 10 publications

References 53 publications

Spatiotemporal electronic spin fluctuations in random nuclear fields in n-CdTe

Spatiotemporal electronic spin fluctuations in random nuclear fields in n-CdTe

Full counting statistics of a quantum dot doped with a single magnetic impurity

Coherent manipulation of a single magnetic atom using polarized single electron transport in a double quantum dot

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