Spin Response Properties in Electronically Robust Ferromagnetic Strained $\text{CrSiSe}_3$ Monolayer under External Electric Fields

TL;DR

This study demonstrates that strained CrSiSe3 monolayers maintain charge stability under electric fields while allowing tunable spin responses, making them promising for spintronic applications.

Contribution

It reveals the coexistence of charge robustness and spin tunability in strained CrSiSe3 monolayers under external electric fields, supported by first-principles calculations.

Findings

Charge sector properties are robust against electric fields up to 0.3 V/Å.

Spin Berry curvature and spin Hall conductivity are highly tunable via electrostatic gating.

Magnon excitations can be effectively tuned by external fields through exchange interactions.

Abstract

Integrating two-dimensional van der Waals magnets into field-effect spintronic devices requires robust charge stability and tunable spin responses. In this study, we investigate the electronic, topological, magnonic, and magneto-optical properties of the strain-engineered ferromagnetic $\text{CrSiSe}_3$ monolayer under out-of-plane external electric fields by using first-principles calculations. We find that for this material, the intrinsic charge sector, including the indirect band gap, charge Berry curvature, optical conductivities, and magneto-optical Kerr effect spectra, exhibits exceptional robustness against applied fields up to 0.3 V/$\r{A}$. Conversely, the spin degrees of freedom demonstrate highly sensitive tunability. Electrostatic gating significantly modulates the spin Berry-like curvature, driving a non-monotonic enhancement in the spin Hall conductivity. Furthermore, external fields effectively tune collective magnon excitations by modifying microscopic Heisenberg exchange interactions. Such coexistence of robust charge immunity and flexible spin manipulation establishes the strained $\text{CrSiSe}_3$ monolayer as a promising platform for stable spintronic devices.