Time-resolved Hanle effect in (In,Ga)As/GaAs quantum dots

Cherbunin, R. V.; Verbin, S. Yu.; Flisinski, K.; Gerlovin, I. Ya.; Ignatiev, I. V.; Vishnevsky, D.; Reuter, D.; Wieck, A. D.; Yakovlev, D. R.; Bayer, М.

doi:10.1088/1742-6596/245/1/012055

Cited by 1 publication

(7 citation statements)

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“…2 and 3 that the curve width reaches a maximum under CW pumping by a beam of constant circular polarization and decreases with increasing dark time when the pump beam is modulated. Its large width has been attributed to the formation of a transverse com ponent B DNP⊥ of nuclear field stabilized by quadrupole splitting of nuclear spin states along the optical axis [11,12]. Since the longitudinal component B DNP|| plays no significant role in strong applied magnetic fields [2,3], dynamics of B DNP|| and B DNP⊥ can be inferred separately from behavior of electron spin polarization in weak and strong fields, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 4 shows an example of time varying spin polarization found by processing experimental data obtained under high field conditions (B = 50 mT), where the dominant role is played by the transverse component of nuclear polarization. The solid curve is a fit by function (11). An analysis of the entire body of experimental data showed that all time dependent spin polarizations measured at B > 20 mT are accu rately approximated by this function.…”

Section: Dynamics Of Nuclear Polarization Risementioning

confidence: 97%

“…However, the classical model fails to explain an increase in Hanle curve width with optical pumping intensity observed in our experiments. Following [11,12], we suppose that the Hanle curve broadening is due to nuclear polarization stabilized by quadrupole splitting of nuclear spin states. An analysis of time resolved measurement data provides quantitative esti mates of the rise and decay times for longitudinal and transverse nuclear fields in the structures under study.…”

Section: Dynamics Of Nuclear Polarization In Ingaas Quantum Dots In Amentioning

confidence: 99%

“…Expression (8), valid for strong applied magnetic fields, can be rewritten analogously by introducing as (11) and (12) to describe the rise and decay of the transverse compo nent of nuclear polarization, respectively.…”

Section: Formulas For Analysismentioning

confidence: 99%

“…The first observations of the time resolved Hanle effect in an ensemble of negatively charged InGaAs/GaAs quantum dots [11] demonstrated that experiments of this kind would provide an effective tool for examining dynamics of a nuclear spin system. In this paper, systematic experimental data presented and analyzed to estimate the nuclear polarization buildup and decay times for the structure under study.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of nuclear polarization in InGaAs quantum dots in a transverse magnetic field

Verbin

Gerlovin

Ignatiev

et al. 2012

J. Exp. Theor. Phys.

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The time resolved Hanle effect is examined for negatively charged InGaAs/GaAs quantum dots. Experimental data are analyzed by using an original approach to separate behavior of the longitudinal and transverse components of nuclear polarization. This made it possible to determine the rise and decay times of each component of nuclear polarization and their dependence on transverse magnetic field strength. The rise and decay times of the longitudinal component of nuclear polarization (parallel to the applied field) were found to be almost equal (approximately 5 ms). An analysis of the transverse component of nuclear polariza tion shows that the corresponding rise and decay times differ widely and strongly depend on magnetic field strength, increasing from a few to tens of milliseconds with an applied field between 20 and 100 mT. Current phenomenological models fail to explain the observed behavior of nuclear polarization. To find an explana tion, an adequate theory of spin dynamics should be developed for the nuclear spin system of a quantum dot under conditions of strong quadrupole splitting.

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Section: Resultsmentioning

confidence: 99%

Section: Dynamics Of Nuclear Polarization Risementioning

confidence: 97%

Section: Dynamics Of Nuclear Polarization In Ingaas Quantum Dots In Amentioning

confidence: 99%

Section: Formulas For Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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