Chiral orbital/spin textures and Edelstein effects in monolayer Janus TMDs

Abstract

We investigate the orbital and spin Edelstein effect(OEE and SEE) in two-dimensional Janus transition metal dichalcogenides (TMDs) of the form MXX${}^{\prime }$ $(M=Mo,W,Nb;X/X^{\prime }=S,Se,Te)$ with the aid of density functional theory calculations and tight-binding model Hamiltonian studies. The chalcogen layers $X$ and $X^{\prime }$, break the mirror symmetry to introduce an internal electric field $E_{int}$ normal to the plane, which is responsible for OEE and SEE. Our results show that in a non-Janus framework, the wavefunctions at the valence and conduction bands are dominated with the $|x^2-y^2>$, $|xy>$, and $|z^2>$ orbitals. Due to the $E_{int}$ of the Janus system, these orbitals are now intermixed with the $|xz>$ and $|yz>$ orbitals to produce a robust orbital texture around the valleys $\Gamma ,K$ and $K^{\prime }$. The spin orbit coupling, in addition to the formation of a spin texture, introduces a chirality reversal to the orbital texture. An applied in plane electric field creates both OEE and SEE with the former being one order higher in magnitude. This makes the Janus materials promising for spin-orbitronics. Our work paves the way for further experimental exploration for orbital and spin orbital torque in Janus TMDs.

References in corpus (23)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• The PseudoDojo: Training and grading a 85 element optimized norm-conserving pseudopotential table
• Wannier90 as a community code: new features and applications
• Study of Intrinsic Spin Hall Effect and Orbital Hall Effect in 4d- and 5d- Transition Metals
• Intrinsic Spin and Orbital Hall Effects from Orbital Texture
• Manipulation of the large Rashba spin splitting in polar two-dimensional transition metal dichalcogenides
• Giant Orbital Hall Effect in Transition Metals: Origin of Large Spin and Anomalous Hall Effects
• Gigantic intrinsic orbital Hall effects in weakly spin-orbit coupled metals
• Orbital-Angular-Momentum Based Origin of Rashba-Type Surface Band Splitting
• Orbital Torque: Torque Generation by Orbital Current Injection
• Observation of the Orbital Rashba-Edelstein Magnetoresistance
• Surface orbitronics: new twists from orbital Rashba physics
• Giant Intrinsic Spin and Orbital Hall Effects in Sr2MO4 (M=Ru,Rh,Mo)
• Orbital Rashba effect in surface oxidized Cu film
• Orbitally Dominated Rashba-Edelstein Effect in Noncentrosymmetric Antiferromagnets
• Intrinsic orbital moment and prediction of a large orbital Hall effect in the 2D transition metal dichalcogenides
• Orbital Hall Insulating Phase in Transition Metal Dichalcogenide Monolayers
• Spin and orbital Edelstein effect in an oxide two-dimensional electron gas: theory and application to AlO${}_x$/SrTiO${}_3$
• Intrinsic orbital and spin Hall effects in monolayer transition metal dichalcogenides
• Magnetoelectric Effects in Gyrotropic Superconductors
• Two-dimensional orbital Hall insulators
• Magnetic Proximity induced efficient charge-to-spin conversion in large area PtSe${}_2$/Ni${}_{80}$Fe${}_{20}$ heterostructures
• Spin and orbital Edelstein effect in spin-orbit coupled noncentrosymmetric superconductor

Cited by in corpus (1)

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