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

Abstract

The interplay of Ising spin-orbit coupling and non-trivial band topology in transition metal dichalcogenides (TMDs) produces anomalous transport and optical properties that are very different from a regular 2D electron gas. The spin-momentum locking of optically excited carriers near a valley point can give rise to an anomalous spin-valley Hall current under the application of an in-plane electric field. TMDs also exhibit strong electron-nuclear hyperfine interactions, but their effect on spin-valley-locked currents remains unknown. Here, we show that hyperfine interactions can create a feedback mechanism in which spin-valley currents generate significant dynamical nuclear polarization which in turn Zeeman shifts excitonic transitions out of resonance with an optical driving field, saturating the production of spin-valley polarization. We propose an experimental signature of dynamic nuclear polarization which can be detected via measurements of the anomalous Hall current. Our results help to elucidate the interplay of valley polarization and nuclear spin dynamics in TMDs.

12 pages, 8 figures. Replaced with the version accepted in Physical Review B

References in corpus (10)

• Two Dimensional Atomic Crystals
• The Valley Hall Effect in MoS2 Transistors
• Observation of Long-Lived Interlayer Excitons in Monolayer MoSe2-WSe2 Heterostructures
• Driven coherent oscillations of a single electron spin in a quantum dot
• Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization
• Theory of electron spin decoherence by interacting nuclear spins in a quantum dot
• Pure quantum dephasing of a solid state electron spin qubit in a large nuclear spin bath coupled by long-range hyperfine-mediated interactions
• Quantum computing by optical control of electron spins
• Nonperturbative master equation solution of central spin dephasing dynamics
• Electron-nuclear dynamics in a quantum dot under non-unitary electron control

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• Transport in two-dimensional topological materials: recent developments in experiment and theory
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• Magnetooptics of layered two-dimensional semiconductors and heterostructures: progress and prospects
• Tunable topological Nernst effect in 2D transition metal dichalcogenides
• Enhancement of nuclear spin coherence times by driving dynamic nuclear polarization at defect centers in solids
• Driven dynamics of a quantum dot electron spin coupled to bath of higher-spin nuclei
• Dynamic Nuclear Polarization from Topological Insulator Helical Edge States
• Bistability of zigzag edge magnetism in graphene nanoribbons induced by electric field
• Nuclear Surface Acoustic Resonance with Spin-Rotation Coupling
• Hyperfine interaction in atomically thin transition metal dichalcogenides