Dynamics of nuclear spin polarization induced and detected by coherently precessing electron spins in fluorine-doped ZnSe

Heisterkamp, Fabian; Kirstein, E.; Greilich, A.; Zhukov, E. A.; Kazimierczuk, T.; Yakovlev, D. R.; Pawlis, A.; Bayer, М.

doi:10.1103/physrevb.93.081409

Cited by 12 publications

(7 citation statements)

References 29 publications

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“…This strong difference in the hyperfine coupling allows us to focus on the selenium nuclei and neglect the zinc nuclei. This assumption is confirmed by nuclear depolarization experiments applying additional radio-frequency fields 35 , 38 . Pumping the zinc nuclei has no impact on the observations.…”

Section: Discussionmentioning

confidence: 55%

Discretization of the total magnetic field by the nuclear spin bath in fluorine-doped ZnSe

et al. 2018

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The coherent spin dynamics of fluorine donor-bound electrons in ZnSe induced by pulsed optical excitation is studied in a perpendicular applied magnetic field. The Larmor precession frequency serves as a measure for the total magnetic field exerted onto the electron spins and, surprisingly, does not increase linearly with the applied field, but shows a step-like behavior with pronounced plateaus, given by multiples of the laser repetition rate. This discretization occurs by a feedback mechanism in which the electron spins polarize the nuclear spins, which in turn generate a local Overhauser field adjusting the total magnetic field accordingly. Varying the optical excitation power, we can control the plateaus, in agreement with our theoretical model. From this model, we trace the observed discretization to the optically induced Stark field, which causes the dynamic nuclear polarization.

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Section: Discussionmentioning

confidence: 55%

Discretization of the total magnetic field by the nuclear spin bath in fluorine-doped ZnSe

et al. 2018

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“…ODNMR Measurements with TRKR Detection: A small radiofrequency (RF) coil of about 5 mm diameter and 5 turns was placed close to the sample surface, similar as in ref. [46]. The coil was mounted flat on the sample surface and the laser beam was going through the core hole of the coil, see Figure S2a, Supporting Information.…”

Section: Methodsmentioning

confidence: 99%

“…One can see in Figure 3b that the repolarization time is 5.5 s, which is in the same range of times reported for III-V and II-VI semiconductors. [45,46]…”

Section: Dynamic Nuclear Polarizationmentioning

confidence: 99%

Lead‐Dominated Hyperfine Interaction Impacting the Carrier Spin Dynamics in Halide Perovskites

et al. 2021

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interest has been boosted by photovoltaic applications, as their quantum efficiency has reached 25.5% [1] but also extending to radiation-sensing [2,3] and a variety of optoelectronic devices. [4][5][6][7] Reaching the limits of high-quality MAPbI 3 , FAPbI 3 , and CsPbI 3 single crystals, combined structures with MA, FA, and caesium (Cs) cation mixture became the state of the art perovskite materials, increasing quantum efficiency and prolonging structural stability from days to months. [2,[8][9][10] Still the fundamental physical properties are close to their parent structures, thus the presented FA 0.9 Cs 0.1 PbI 2.8 Br 0.2 acts as a valid model system for the class of lead halide perovskites.Compared to conventional III-V and II-VI semiconductors, the perovskites have in some sense an inverted band structure: the valence band (VB) states are formed by s-orbitals, while the conduction band (CB) states are contri buted by p-orbitals. The strong spin-orbit coupling and in particular the Rashba effect, [11][12][13][14] also exchanges the spin properties of electrons and holes. [15,16] As a consequence, the hyperfine interaction with the lattice nuclei is dominated by the holes and not by the electrons.The perovskite band structure gives clean polarization selection rules for the optical transitions so that in combinationThe outstanding optical quality of lead halide perovskites inspires studies of their potential for the optical control of carrier spins as pursued in other materials. Entering largely uncharted territory, time-resolved pumpprobe Kerr rotation is used to explore the coherent spin dynamics of electrons and holes in bulk formamidinium caesium lead iodine bromide (FA 0.9 Cs 0.1 PbI 2.8 Br 0.2 ) and to determine key parameters characterizing interactions of their spins, such as the g-factors and relaxation times. The demonstrated long spin dynamics and narrow g-factor distribution prove the perovskites as promising competitors for conventional semiconductors in spintronics. The dynamic nuclear polarization via spin-oriented holes is realized and the identification of the lead ( 207 Pb) isotope in optically detected nuclear magnetic resonance proves that the hole-nuclei interaction is dominated by the lead ions. A detailed theoretical analysis accounting for the specifics of the lead halide perovskite materials allows the evaluation of the underlying hyperfine interaction constants, both for electrons and holes. Recombination and spin dynamics evidence that at low temperatures, photogenerated electrons and holes are localized at different regions of the perovskite crystal, resulting in their long lifetimes up to 44 μs. The findings form the base for the tailored development of spin-optoelectronic applications for the large family of lead halide perovskites and their nanostructures.

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“…Dynamic nuclear polarization due to spins excited by a periodic train of pulses and rotated by the optical Stark effect has been previously observed and characterized in ZnSe [11]. In those studies, the nuclear systems T 1 time was orders of magnitude shorter than the lab time of their measurements [30,31]. Hence, their nuclear system quickly reached steady state during their experiments and no field sweep direction dependence was observed.…”

Section: Discussionmentioning

confidence: 93%

Dynamic Nuclear Polarization by optical Stark effect in periodically-pumped gallium arsenide

Dominguez,

Iafrate,

Sih

2020

Preprint

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Optical pump-probe time-and magnetic-field-resolved Kerr rotation measurements provide a window into the mechanisms that generate dynamic nuclear polarization in bulk gallium arsenide. Previously, we have reported an unexpected dependence of the direction of the nuclear polarization on the sweep direction of the applied external magnetic field. In this paper, we present numerical calculations based on a model for this nuclear polarization due to the optical orientation and optical Stark effect produced by a train of ultrafast optical pulses. We demonstrate the correspondence of the model to our experimental measurements for different laser wavelengths and magnetic field sweep rates. Finally, we show that the model reproduces the sweep direction dependence and provides an explanation for this behavior.

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Dynamics of nuclear spin polarization induced and detected by coherently precessing electron spins in fluorine-doped ZnSe

Cited by 12 publications

References 29 publications

Discretization of the total magnetic field by the nuclear spin bath in fluorine-doped ZnSe

Discretization of the total magnetic field by the nuclear spin bath in fluorine-doped ZnSe

Lead‐Dominated Hyperfine Interaction Impacting the Carrier Spin Dynamics in Halide Perovskites

Dynamic Nuclear Polarization by optical Stark effect in periodically-pumped gallium arsenide

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