The emergence of altermagnets offers a promising platform for studying spin-charge coupling scenarios. In this study, we investigate the significant regulatory influence of uniaxial strain on the electronic and plasmonic properties of two-dimensional $d$-wave altermagnets, specifically, monolayer ${\text{V}}_2{\text{Se}}_2\text{O}$. Our analysis, based on density functional theory calculations and a tight-binding model of an altermagnetic Lieb lattice, reveals that applying strain along the [100] direction effectively lifts the degeneracy between the X and Y valleys, enabling the generation of spin-polarized carriers at optimal hole-doping concentrations. Compressive strain along the [100] direction promotes directional propagation of spin plasmons along the $x$ direction, whereas tensile strain shifts this behavior to the $y$ direction. Moreover, applying tensile strain along the [110] direction retains the $d$-wave altermagnetic characteristics while resulting in distinct anisotropic responses in spin plasmons that diverge from those induced by [100] strain. The observation of low-loss spin plasmons and their strain-tunable propagation in monolayer ${\text{V}}_2{\text{Se}}_2\text{O}$ greatly enhance the application potential of spin plasmons and pave the way for exploration of mechanical-electric and mechanical-optical couplings in altermagnetic materials.

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• Spin polarization
• Surface plasmons
• 2-dimensional systems
• First-principles calculations
• Tight-binding model