The magnon orbital Hall effect in two-dimensional (2D) honeycomb antiferromagnets driven by pseudogauge fields induced by surface acoustic waves (SAWs) has been investigated. Unlike previous studies where the orbital Hall response of magnons was primarily driven by temperature gradients, we demonstrate that strain-induced pseudoelectric fields generated by Rayleigh-type SAWs can also induce a finite magnon orbital Hall current. In the absence of Dzyaloshinskii-Moriya (DM) interaction, the contribution originates solely from the valley-independent pseudoelectric field ${\mathbf{E}}_1^s$, whereas the valley-contrasting field ${\mathbf{E}}_2^s$ gives no net contribution. When the DM interaction is introduced, the valley degeneracy in the magnon bands is lifted, leading to a population imbalance between the $K$ and $K^{\prime }$ valleys, which activates additional contributions from ${\mathbf{E}}_2^s$, and consequently modifies the anomalous orbital Hall conductivity of magnons. Our results reveal a distinct mechanistic pathway to control magnon orbital transport using SAWs, offering opportunities for valley-orbitronics and magnonic device functionalities in 2D magnetic systems.

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• Magnons
• Piezoelectricity
• Valley degrees of freedom
• Valleytronics
• 2-dimensional systems
• Bogoliubov-de Gennes equations
• Spin wave theory