Effect of magnetic impurities of universal conductance fluctuations

Benoı̂t, A.; Mailly, D.; Perrier, Pierre; Nédellec, P.

doi:10.1016/0749-6036(92)90388-l

Cited by 18 publications

(22 citation statements)

References 5 publications

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“…These are robust against the breaking of time-reversal invariance ͑while Cooperon contributions are rapidly suppressed by small fields͒ but are sensitive to dephasing by inelastic processes. Indeed, Benoit et al 18 and Pierre et al 5 have shown that the amplitude of Aharonov-Bohm oscillations increases by almost an order of magnitude for increasing magnetic fields, clearly showing a suppression of dephasing by magnetic ͑Zeeman͒ fields. This leads to the conclusion that the main mechanism of dephasing in the investigated lowtemperature regime is the scattering from magnetic impurities.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field dependence of dephasing rate due to diluted Kondo impurities

2007

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We investigate the dephasing rate, 1 / , of weakly disordered electrons due to scattering from diluted dynamical impurities. Our previous result for the weak-localization dephasing rate is generalized from diluted Kondo impurities to arbitrary dynamical defects with typical energy transfer larger than 1 / . For magnetic impurities, we study the influence of magnetic fields on the dephasing of Aharonov-Bohm oscillations and universal conductance fluctuations both analytically and using the numerical renormalization group. These results are compared to recent experiments.

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Section: Introductionmentioning

confidence: 99%

Magnetic field dependence of dephasing rate due to diluted Kondo impurities

2007

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“…It may appear that the field will reduce fluctuations of the Mn spins and, thus, will result in an increase in the UCF amplitude. Indeed, such an increase has been found by others [15] and by us in the paramagnetic phase. At T < Tg , however, rms(ΔG) of both the UCF (Fig.…”

Section: Resultsmentioning

confidence: 58%

“…Very recently Neuttiens et al [14] reported on 1/f noise in wires of AuFe spin glass. Despite this progress, the picture emerging from the studies of mesoscopic metallic spin-glass systems is rather confusing [15].…”

Section: Introductionmentioning

confidence: 99%

Transport in Quantum Structures of Diluted Magnetic Semiconductors

Jaroszyński

1999

Acta Phys. Pol. A

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. This paper reviews recent millikelvin studies of magnetoconductance and noise in nanostructures of a diluted magnetic semiconductor n-Cd 1-x Mnx Te. These studies were particularly rewarding for probing the influence of magnetic ions upon mesoscopic phenomena. The accumulated results demonstrated the existence of a new driving mechanism of the universal conductance fluctuations in magnetic systems. Several signatures of spin-glass freezing were observed, such as the appearance of 1/f conductance noise, aging, thermal, and magnetic irreversibilities as well as a strong increase in the amplitude of both conductance fluctuations and noise when temperature and the magnetic field were lowered below the freezing line. A statistical analysis of conductance noise made it possible to investigate the nature of excitations in spin-glass phase, and to discriminate between competing theoretical models.

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“…Second, the EABE peak [24] is observed at a sufficiently large magnetic field (see Fig. 1 and discussion below), where the scattering on magnetic impurities, if any, is strongly suppressed [12,[25][26][27]. Third, as we show below, the inelastic interactions with phonons are much weaker for the light-excited electron-hole pairs than for the electrons participating in transport, so other dephasing mechanisms, such as pure dephasing and electron-impurity scattering, become more pronounced.…”

Section: Introductionmentioning

confidence: 99%

Decoherence in semiconductor nanostructures with type-II band alignment: All-optical measurements using Aharonov-Bohm excitons

et al. 2017

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We examine the temperature dependence of the visibility of the excitonic Aharonov-Bohm peak in type-II quantum dots. We obtain a functional temperature dependence, which is similar to that determined by transport experiments, namely, with T -1 term due to electron-electron collisions and with T -3 term due to electron-phonon interactions. However, the magnitude of the latter term is much smaller than that for the transport electrons and similar to the interaction strength of the exciton-phonon coupling. Such suppressed electron-phonon interaction ushers a way for all-optical studies of decoherence processes in semiconductor nanostructures as other dephasing mechanisms become more pronounced.

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Effect of magnetic impurities of universal conductance fluctuations

Cited by 18 publications

References 5 publications

Magnetic field dependence of dephasing rate due to diluted Kondo impurities

Magnetic field dependence of dephasing rate due to diluted Kondo impurities

Transport in Quantum Structures of Diluted Magnetic Semiconductors

Decoherence in semiconductor nanostructures with type-II band alignment: All-optical measurements using Aharonov-Bohm excitons

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