Interplay of valley polarization and dynamic nuclear polarization in 2D transition metal dichalcogenides

Sharma, Girish; Economou, Sophia E.; Barnes, Edwin

doi:10.1103/physrevb.96.125201

Cited by 15 publications

(12 citation statements)

References 56 publications

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“…Recently, there are proposals to optically control the entanglement of electron and nuclear spins in TMDC monolayers via intervalley terms of the hyperfine interaction [267][268][269] . It has been argued that similar to the case of electron and hole hyperfine interactions in III-V semiconductors 270,271 , they are of short range nature in TMDCs as well.…”

Section: Valley Polarization and Coherence In Magnetic Fieldsmentioning

confidence: 99%

Magneto-optics of layered two-dimensional semiconductors and heterostructures: Progress and prospects

Arora

2021

Journal of Applied Physics

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Beginning with the 'conventional' two-dimensional (2D) quantum wells (QWs) based on III-V and II-VI semiconductors in the 1970s, to the recent atomically-thin sheets of van der Waals materials such as 2D semiconducting transition metal dichalcogenides (TMDCs) and 2D magnets, the research in 2D materials is continuously evolving and providing new challenges. Magnetooptical spectroscopy has played a significant role in this area of research, both from fundamental physics and technological perspectives. A major challenge in 2D semiconductors such as TMDCs is to understand their spin-valley-resolved physics, and their implications in quantum computation and information research. Since the discovery of valley Zeeman effects, deep insights into the spin-valley physics of TMDCs and their heterostructures has emerged through magnetooptical spectroscopy. In this perspective, we highlight the role of magnetooptics in many milestones such as the discovery of interlayer excitons, phase control between coherently-excited valleys, determination of exciton-reduced masses, Bohr radii and binding energies, physics of the optically-bright and dark excitons, trions, other many-body species such as biexcitons and their phonon replicas in TMDC monolayers. The discussion accompanies open questions, challenges and future prospects in the field including comments on the magnetooptics of van der Waals heterostructures involving TMDCs and 2D magnets.

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Section: Valley Polarization and Coherence In Magnetic Fieldsmentioning

confidence: 99%

Magneto-optics of layered two-dimensional semiconductors and heterostructures: Progress and prospects

Arora

2021

Journal of Applied Physics

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“…TMDs can bring new challenges and peculiarities in the hardly explored field of the electron-nuclear interaction in TMD MLs [53]. Any theoretical description of the effects related to the hyperfine interaction is based on the form of the hyperfine interaction Hamiltonian.…”

Section: Introductionmentioning

confidence: 99%

Hyperfine interaction in atomically thin transition metal dichalcogenides

Avdeev

Smirnov

2019

Nanoscale Adv.

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Localization of charge carriers in monolayers (MLs) of transition metal dichalcogenides (TMDs) dramatically increases spin and valley coherence times, and, by analogy with other systems, the role of the hyperfine interaction should enhance. We perform theoretical analysis of the intervalley hyperfine interaction in TMD MLs based on the group representation theory. We demonstrate, that the spin-valley locking leads to the helical structure of the in-plane hyperfine interaction. In the upper valence band the hyperfine interaction is shown to be of the Ising type, which can be used for fabrication of the atomically thin quantum dots with the long spin and valley coherence times.

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“…However, many works have shown that the state of the bath, and consequently its deleterious effects, can be influenced by driving the electron spin. For example, several experiments have shown that driving can generate dynamic nuclear polarization (DNP), an effect that has been observed in self-assembled QDs [53][54][55][56][57][58][59][60][61][62][63][64] and also in other systems such as gated QDs [65][66][67][68], quantum wires [69] and in bulk materials [70,71], findings that have been supported by a number of theory works [72][73][74][75][76][77][78][79][80][81][82][83][84]. An important example of DNP in self-assembled QDs is the mode-locking experiment of Ref.…”

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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Interplay of valley polarization and dynamic nuclear polarization in 2D transition metal dichalcogenides

Cited by 15 publications

References 56 publications

Magneto-optics of layered two-dimensional semiconductors and heterostructures: Progress and prospects

Magneto-optics of layered two-dimensional semiconductors and heterostructures: Progress and prospects

Hyperfine interaction in atomically thin transition metal dichalcogenides

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

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