Intrinsic valley polarization of magnetic VSe₂ monolayers

Abstract

Intrinsic valley polarization can be obtained in VSe monolayers with broken inversion symmetry and time reversal symmetry. First-principles investigations reveal that the magnitude of the valley splitting in magnetic VSe induced by spin-orbit coupling reaches as high as 78.2 meV and can be linearly tuned by biaxial strain. Besides conventional polarized light, hole doping or illumination with light of proper frequency can offer effective routes to realize valley polarization. Moreover, spin-orbit coupling in monolayer VSe breaks not only the valley degeneracy but also the three-fold rotational symmetry in band structure. The intrinsic and tunable valley splitting and the breaking of optical isotropy bring additional benefits to valleytronic and optoelectronic applications.

Ab initio study on anisotropic thermoelectric transport in ternary pnictide KZnP

“…Due to the existence of six atoms in the primitive cell of bulk KZnP, there are eighteen phonon branches including three acoustic and fifteen optical branches. All three acoustic branches are well described by a linear dispersion around Γ, unlike those in two-dimensional materials, where low-frequency out-of-plane acoustic (ZA) branch is quadratic [18,[27][28][29]. The ZA and transverse acoustic branches are nearly degenerated near the zone center (  q 0).…”

Epitaxially grown monolayer VSe 2 : an air-stable magnetic two-dimensional material with low work function at edges

“…Both bulk phase [24] and multilayer film [25] have been reported to be ferromagnetic. Calculations predict the existence of magnetism even in monolayer VSe 2 [25][26][27]. As for the fabrication of VSe 2 materials, multilayer VSe 2 nanosheets 2.28-4.65 nm in thickness has been reported by mechanical exfoliation [25].…”

Strain Engineering on the Electronic and Optical Properties of WSSe Bilayer

“…Based on the unique Janus TMDC materials, realizing an accurate control of their electronic and optical properties is vital to meeting the multiple needs of device design. Electric field [9,10], strain [11,12], surface decoration [13,14], and magnetic doping [15][16][17] have been proven as effective means to modulate the electronic and optical behaviors of 2D TMDCs. Among these methods, strain engineering is reversible with the controllable process, while without generating additional lattice defects and damage in the materials.…”