Spintronic Properties in Two-Dimensional Transition Metal Dichalcogenides

Two-dimensional transition metal dichalcogenides (TMDs) have emerged as a versatile platform for spintronic research owing to their inherently strong spin–orbit coupling and broken inversion symmetry at the monolayer limit. In these materials, heavy transition metal atoms such as molybdenum or tungsten confer substantial spin splitting in both valence and conduction bands, while the hexagonal lattice gives rise to distinct valley degrees of freedom at inequivalent K and K′ points. The coupling between spin and valley indices enables phenomena such as the valley Hall effect and spin–valley locking, in which spin currents can be generated and detected via electrical or optical means without ferromagnetic contacts. Moreover, stacking, heterostructuring and external perturbations such as strain or electric fields offer precise control over band alignments, Rashba spin splitting and interlayer coupling. These capabilities point towards low-power spin transistors, nonvolatile memory elements and quantum information devices that exploit both spin and valley pseudospin. The global significance of 2D TMD spintronics lies in its potential to integrate logic, memory and optoelectronic functions on a single, atomically thin platform.

Research from Nature Portfolio

Recent studies have applied strain engineering to TMD nanoribbons, revealing that uniaxial and curved strain fields drive an indirect-to-metallic phase transition while modulating the anomalous valley Hall conductivity. Tight-binding simulations demonstrate that pseudogauge fields arising from spatially varying strain act on Dirac electrons to produce quantised Landau levels. Crucially, both the magnitude and the sign of the valley Hall response can be tuned by altering the strain profile, offering a mechanical means to switch valley polarisation. These findings establish a robust route towards strain-controlled valleytronic devices and underline the interplay between lattice deformations and topological transport in low-dimensional systems.

Spintronic Properties in Two-Dimensional Transition Metal Dichalcogenides publication trend

The graph below shows the total number of articles in spintronic properties in two-dimensional transition metal dichalcogenides across all publications each year (not limited to Nature Index journals).

Technical terms

Spintronics: The field exploiting the electron’s spin degree of freedom alongside its charge to store, process and transmit information.

Transition metal dichalcogenides (TMDs): Layered materials composed of a transition metal atom between two chalcogen atoms, which exhibit strong spin–orbit effects when thinned to monolayers.

Spin–orbit coupling (SOC): The interaction between an electron’s spin and its orbital motion around the nucleus, leading to energy band splitting in heavy-element systems.

Rashba effect: Spin splitting of electronic bands induced by broken inversion symmetry and an asymmetric electric potential at interfaces or in monolayers.

Valley Hall effect: Transverse separation of carriers belonging to different momentum valleys in materials with broken inversion symmetry, enabling valley current generation.

Spin splitting: Energy separation of spin-up and spin-down electronic states, forming the basis for spin-polarised transport.

References

1. Strain-modulated Rashba spin splitting and optical absorption of MoSSe/WSe2 heterostructures. Applied Physics A (2023).
2. Strain engineering of electronic properties and anomalous valley hall conductivity of transition metal dichalcogenide nanoribbons. Scientific Reports (2022).
3. High-throughput inverse design and Bayesian optimization of functionalities: spin splitting in two-dimensional compounds. Scientific Data (2022).