Theoretical prediction of valley spin splitting in two-dimensional Janus MSiGeZ₄ (M = Cr and W; Z = N, P, and As)

Abstract

With the exploration of valleytronic materials in the MA2Z4 structure, larger valley spin splitting has been a hot topic of research. Based on first-principles calculations, we predict six valleytronic materials...

Emergence and Stability of Hierarchical Structures under Cylindrical Confinement

“…From our previous work, we find there is the close relationship between confinement and bulk, such as the concentric ring can be regarded as the lamellae in bulk, while the perforated cylinder and helical phase formed under cylindrical confinement are the reflection of gyroid and cylinder in bulk. [ 56,57 ] An interesting transition sequence of ordered nanostructures under cylindrical confinement, H 2 → P 2 → L 2 → P 3 C → H 3 C, is predicted, which is corresponding to the phase transition of C → G → L → G → C in bulk. [ 57 ] It is natural to explore the phase transition sequence as the volume fraction of the tail block f A changes.…”

“…[ 39,55 ] They also find that the helical morphologies are regarded as one type of cylindrical phase in bulk, while perforated layers nanostructure can be treat as the derivation of gyroid morphologies in bulk. [ 56 ] Subsequently, corresponding to the phase transition of C → G → L → G → C in bulk, an interesting transition sequence of ordered nanostructures under cylindrical confinement, H 2 → P 2 → L 2 → P 3 C → H 3 C, was explored. [ 57 ] This phase transition sequence is general for both the linear and star polymers.…”

“…When introducing cylindrical confinement to the multi‐block copolymer, we expect the tail block will form the large‐scale temple, such as the concentric ring, perforated cylinder, helix, and disk nanostructures when the interaction parameter of mid‐thin blocks χ BC is low. [ 39,55,56,58,59 ] However, to the best of our knowledge, the self‐assemble of multiblock copolymer under cylindrical confinement is limit. It is natural to ask whether the hierarchical phase with different mid‐thin layers k can form under cylindrical confinement at increased χ BC .…”

Rashba effect: a chemical physicist's approach

“…[45][46][47][48][49][50] However, it also delves into GSS induced in novel 2D layered materials, including transition-metal dichalcogenides (TMDs), [51][52][53][54][55][56][57] MXenes, [58][59][60][61][62][63] and a variety of other sheets. [64][65][66][67][68][69][70][71][72] To facilitate the ongoing efforts, it is crucial to develop more robust strategies for enhancing spin splitting. Clear guiding principles need to be established to design materials with desired GSS.…”

“…As a result, it becomes essential to thoroughly characterize and understand spin splitting in novel cases, such as on van der Waals (vdW) heterostructures, 3,52,54,60,64,73 topological insulators, 17,74,75 and Janus-type 2D materials. 61,63,70,72 Additionally, structural modification of these novel platforms must be considered to unlock their full potential for spintronics applications.…”