Intervalley Scattering of Interlayer Excitons in a MoS/MoSe/MoS Heterostructure in High Magnetic Field
arXiv:1805.10010 · doi:10.1021/acs.nanolett.8b01484
Abstract
Degenerate extrema in the energy dispersion of charge carriers in solids, also referred to as valleys, can be regarded as a binary quantum degree of freedom, which can potentially be used to implement valleytronic concepts in van der Waals heterostructures based on transition metal dichalcogenides. Using magneto-photoluminescence spectroscopy, we achieve a deeper insight into the valley polarization and depolarization mechanisms of interlayer excitons formed across a MoS/MoSe/MoS heterostructure. We account for the non-trivial behavior of the valley polarization as a function of the magnetic field by considering the interplay between exchange interaction and phonon mediated intervalley scattering in a system consisting of Zeeman-split energy levels. Our results represent a crucial step towards the understanding of the properties of interlayer excitons, with strong implications for the implementation of atomically thin valleytronic devices.
arXiv commentjust accepted in Nano Letters, DOI: 10.1021/acs.nanolett.8b01484
References in corpus (34)
- Van der Waals heterostructures
- Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
- Control of valley polarization in monolayer MoS2 by optical helicity
- Valley polarization in MoS2 monolayers by optical pumping
- MoS_2 as an ideal material for valleytronics: valley-selective circular dichroism and valley Hall effect
- Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS2
- Ultrafast Charge Transfer in Atomically Thin MoS2/WS2 Heterostructures
- k.p theory for two-dimensional transition metal dichalcogenide semiconductors
- Three-band tight-binding model for monolayers of group-VIB transition metal dichalcogenides
- Magnetic Control of Valley Pseudospin in Monolayer WSe2
- Valley Zeeman Effect in Elementary Optical Excitations of a Monolayer WSe2
- Breaking of valley degeneracy by magnetic field in monolayer MoSe2
- Detecting Topological Currents in Graphene Superlattices
- Moiré excitons: from programmable quantum emitter arrays to spin-orbit coupled artificial lattices
- Intrinsic Exciton Linewidth in Monolayer Transition Metal Dichalcogenides
- Valley Splitting and Polarization by the Zeeman Effect in Monolayer MoSe2
- Long-lived direct and indirect interlayer excitons in van der Waals heterostructures
- Direct Measurement of Exciton Valley Coherence in Monolayer WSe
- Exciton fine structure and spin decoherence in monolayers of transition metal dichalcogenides
- Exciton Valley Dynamics probed by Kerr Rotation in WSe2 Monolayers
- Theory of optical absorption by interlayer excitons in transition metal dichalcogenide heterobilayers
- Magneto-Optics of Exciton Rydberg States in a Monolayer Semiconductor
- Field-induced polarisation of Dirac valleys in bismuth
- Ultrafast Manipulation of Valley Pseudospin
- Valley splitting of AlAs two-dimensional electrons in a perpendicular magnetic field
- Giant Zeeman splitting inducing near-unity valley polarization in van der Waals heterostructures
- Probing the inter-layer exciton physics in a MoS/MoSe/MoS van der Waals heterostructure
- Optical investigation of monolayer and bulk tungsten diselenide (WSe) in high magnetic fields
- Quantum-Confined Electronic States arising from Moiré Pattern of MoS2-WSe2 Hetero-bilayers
- Spatially Resolving Valley Quantum Interference of a Donor in Silicon
- Dark excitons and the elusive valley polarization in transition metal dichalcogenides
- Magneto-excitons in large area CVD grown monolayer MoS and MoSe on sapphire
- Opto-valleytronic imaging of atomically thin semiconductors
- Defect healing and charge transfer mediated valley polarization in MoS/MoSe/MoS trilayer van der Waals heterostructures
Cited by in corpus (8)
- Moiré Intralayer Excitons in a MoSe/MoS Heterostructure
- Exciton-exciton interaction in transition metal dichalcogenide monolayers and van der Waals heterostructures
- Interlayer Exciton Valleytronics in Bilayer Heterostructures Interfaced with a Metasurface
- Approaching the Intrinsic Properties of Moiré Structures Using Atomic Force Microscopy Ironing
- Magnetically tunable exciton valley coherence in monolayer WS mediated by the electron-hole exchange and exciton-phonon interactions
- Laser-field detuning assisted optimization of exciton valley dynamics in monolayer WSe: Geometric quantum speed limit
- Effect of spin-dependent tunneling and intervalley scattering in magnetic-semiconductor van der Waals heterostructures on exciton and trion polarization
- Ellipticity-Controlled Bright-Dark Coherence Transition in Monolayer WSe2