Interplay of spin mode locking and nuclei-induced frequency focusing in quantum dots

Schering, Philipp; Scherer, Philipp W.; Uhrig, Götz S.

doi:10.1103/physrevb.102.115301

Cited by 13 publications

(46 citation statements)

References 78 publications

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“…This is the key difference to ref. [19] where a more realistic exponential parametrization of the hyperfine couplings is considered for a single nuclear spin type. Using the box model, however, does not change the qualitative interplay of SML and NIFF [19].…”

Section: Spin Dynamicsmentioning

confidence: 99%

“…The hyperfine interaction is a magnitude smaller for heavy holes than for electrons and also strongly anisotropic [31][32][33]. Since this was found to barely affect the physics [19], we neglect this interaction here for simplicity. Due to the large number of nuclei in a QD (10 4 − 10 6 ), the Overhauser field can safely be treated as a classical field based on the central limit theorem [27,34].…”

Section: Spin Dynamicsmentioning

confidence: 99%

“…In an inhomogeneous ensemble of QDs, the actually observed dephasing time T * 2 shows a strong magnetic field dependence due to a spread of the electronic g factors [17,36]. We do not include this inhomogeneity because it turned out to be irrelevant for the NESS [19]. In the simulations, we use N = 60 nuclear spins since the number of pulses and therefore also the run time required to reach the NESS scales linearly with N because larger N implies smaller A k .…”

Section: Spin Dynamicsmentioning

confidence: 99%

“…We consider the application of resonant π pulses with σ − helicity. Then, the spin components before (S b ) and after (S a ) the pulse are normally distributed with expectation values and variances [19,20] fulfilling…”

Section: Spin Dynamicsmentioning

confidence: 99%

See 3 more Smart Citations

Nuclear magnetic resonance spectroscopy of nonequilibrium steady states in quantum dots

Schering,

Uhrig

2020

Preprint

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The optically induced polarization of localized electron spins in an ensemble of quantum dots (QDs) dephases due to the interaction with the surrounding nuclear spins. Despite this dephasing, the spins in the QDs can be controlled to respond coherently by applying periodic laser pulses, leading to a revival of the spin polarization before each pulse. This effect, known as spin mode locking, strongly depends on an emerging selection of certain polarizations of the nuclear spin bath which is driven to a steady state far from equilibrium. We investigate the influence of the nuclear composition in InxGa1−xAs QDs on this nonequilibrium behavior and demonstrate that nuclear magnetic resonances (NMR) appear as very sharp dips in the revival signal. This suggests a novel kind of NMR spectroscopy.

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Section: Spin Dynamicsmentioning

confidence: 99%

Section: Spin Dynamicsmentioning

confidence: 99%

Section: Spin Dynamicsmentioning

confidence: 99%

Section: Spin Dynamicsmentioning

confidence: 99%

See 2 more Smart Citations

Nuclear magnetic resonance spectroscopy of nonequilibrium steady states in quantum dots

Schering,

Uhrig

2020

Preprint

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“…[54]. Theoretical works that have specifically focused on mode-locking type experiments have either assumed I = 1/2 nuclear baths [72,74] or utilized semiclassical methods [37,38]. While such approaches have been successful in reproducing qualitative features seen in experiments including dynamic nuclear polarization and mode-locking, it remains an outstanding challenge to develop a more quantitatively accurate description of the driven electron-nuclear spin system.…”

Section: Introductionmentioning

confidence: 99%

Driven dynamics of a quantum dot electron spin coupled to bath of higher-spin nuclei

Vezvaee,

Sharma,

Economou

et al. 2020

Preprint

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The interplay of optical driving and hyperfine interaction between an electron confined in a quantum dot and its surrounding nuclear spin environment produces a range of interesting physics such as mode-locking. In this work, we go beyond the ubiquitous spin 1/2 approximation for nuclear spins and present a comprehensive theoretical framework for an optically driven electron spin in a self-assembled quantum dot coupled to a nuclear spin bath of arbitrary spin. Using a dynamical mean-field approach, we compute the nuclear spin polarization distribution with and without the quadrupolar coupling. We find that while hyperfine interactions drive dynamic nuclear polarization and mode-locking, quadrupolar couplings counteract these effects. The tension between these mechanisms is imprinted on the steady-state electron spin evolution, providing a way to measure the importance of quadrupolar interactions in a quantum dot. Our results show that higher-spin effects such as quadrupolar interactions can have a significant impact on the generation of dynamic nuclear polarization and how it influences the electron spin evolution.

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Simulation of Nonequilibrium Spin Dynamics in Quantum Dots Subjected to Periodic Laser Pulses

Schering

Scherer

Uhrig

2021

High Performance Computing in Science and Engineering '20

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Interplay of spin mode locking and nuclei-induced frequency focusing in quantum dots

Cited by 13 publications

References 78 publications

Nuclear magnetic resonance spectroscopy of nonequilibrium steady states in quantum dots

Nuclear magnetic resonance spectroscopy of nonequilibrium steady states in quantum dots

Driven dynamics of a quantum dot electron spin coupled to bath of higher-spin nuclei

Simulation of Nonequilibrium Spin Dynamics in Quantum Dots Subjected to Periodic Laser Pulses

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