Negative circular polarization dynamics in InP/InGaP quantum dots

Nekrasov, S. V.; Kusrayev, Yu. G.; Акимов, И. А.; Korenev, V. L.; Langer, L.; Salewski, M.

doi:10.1088/1742-6596/741/1/012189

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…It should be noted that unlike for positively charged excitons (X + trions) [10] and neutral excitons [11], the circular polarization dynamics of the negatively charged exciton PL does not exhibit oscillations in Voigt magnetic field, reported for InP/(In,Ga)P QDs in Ref. [11,12]. The absence of these oscillations is discussed in Section IV B.…”

Section: Introductionmentioning

confidence: 79%

Spin beats in the photoluminescence polarization dynamics of charged excitons in InP/(In,Ga)P quantum dots in presence of nuclear quadrupole interaction

Nekrasov,

Akimov,

Kusrayev

et al. 2019

Preprint

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The spin dynamics of positively (X + ) and negatively (X − ) charged excitons in InP/In0.48Ga0.52P quantum dots subject to a magnetic field is studied. We find that a characteristic feature of the system under study is the presence of nuclear quadrupole interaction, which leads to stabilization of the nuclear and electron spins in a quantum dot in zero external magnetic field. In detail, the nuclear quadrupole interaction leads to pinning of the Overhauser field along the quadrupole axis, which is close to the growth axis of the heterostructure. The nuclear effects are observed only when resident electrons are confined in the quantum dots, i.e. for X − trion photoexcitation. The presence of X − and X + trion contributions to the photoluminescence together with the quadrupole interaction significantly affects the dynamics of optical orientation in Voigt magnetic field. In absence of dynamic nuclear spin polarization the time evolution of the photoluminescence polarization was fitted by a form which describes the electron spin relaxation in "frozen" nuclear field fluctuations. In relatively large external magnetic fields exceeding 60 mT good agreement between theory and experiment is achieved.

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Section: Introductionmentioning

confidence: 79%

Spin beats in the photoluminescence polarization dynamics of charged excitons in InP/(In,Ga)P quantum dots in presence of nuclear quadrupole interaction

Nekrasov,

Akimov,

Kusrayev

et al. 2019

Preprint

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“…В магнитном поле можно ожидать осцилляций поляризации ФЛ трионов вследствие ларморовской прецессии спинов дырок и электронов. Однако, в работах [7,8] сообщалось, что во времяразрешенных зависимостях ОЦП ФЛ X − трионов в ансамбле КТ InP/(In, Ga)P в магнитном поле в геометрии Фойхта отсутствуют осцилляции. В то же время в динамике оптической ориентации ФЛ нейтральных [7] и положительно заряженных экситонов [9,10] в КТ осцилляции в поперечном магнитном поле наблюдаются.…”

Section: Introductionunclassified

“…Мы согласны с принципиальной возможностью существования такого механизма " замывания" осцилляций поляризации, однако, представляется маловероятным, что указанный механизм является универсальным, справедливым для разных условий возбуждения и для разных структур. Между тем в магнитном поле в геометрии Фойхта эксперимент показывает устойчивое отсутствие осцилляций в динамике ОЦП, наблюдающееся в нескольких структурах с КТ InP/(In, Ga)P с различными параметрами [7,8].…”

Section: Introductionunclassified

Спиновая динамика отрицательно заряженных экситонов в квантовых точках InP/(In,Ga)P в магнитном поле

Некрасов¹,

Кусраев²,

Akimov

et al. 2020

Физика Твердого Тела

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The dynamics of the photoluminescence negative circular polarization of the InP/(In,Ga)P quantum dots ensemble was studied. We find that in the time-resolved dependences of the polarization there are no oscillations in Voigt magnetic field. Also, with increasing field the polarization declines to zero. Such behavior is attributed to the peculiarities of the negatively charged exciton spin dynamics, particularly, to the fact that in the negatively charged exciton ground state the spin dynamics is governed by the heavy hole. We show that magnetic field depolarization of the photoluminescence occurs once the field of dynamically polarized nuclear spins acting on electron spins is surpassed.

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Effect of nuclear quadrupole interaction on spin beats in photoluminescence polarization dynamics of charged excitons in InP/(In,Ga)P quantum dots

et al. 2019

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Negative circular polarization dynamics in InP/InGaP quantum dots

Cited by 3 publications

References 8 publications

Spin beats in the photoluminescence polarization dynamics of charged excitons in InP/(In,Ga)P quantum dots in presence of nuclear quadrupole interaction

Spin beats in the photoluminescence polarization dynamics of charged excitons in InP/(In,Ga)P quantum dots in presence of nuclear quadrupole interaction

Спиновая динамика отрицательно заряженных экситонов в квантовых точках InP/(In,Ga)P в магнитном поле

Effect of nuclear quadrupole interaction on spin beats in photoluminescence polarization dynamics of charged excitons in InP/(In,Ga)P quantum dots

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