The spin-dependent transport properties and spin polarization through a time-periodic potential well in the altermagnet are investigated. Photon-assisted transport occurs in periodically driven quantum systems, where incident electrons can exchange energy with the driven field by absorbing or emitting photons (in units of $\hslash \omega$), leading to transitions between electron channels. The photon-assisted tunneling spectrum in the altermagnet features Fano resonances with asymmetric line shapes, where the resonance energy is located exactly at $E=E_b+\hslash \omega$ ($E_b$ is the bound-state energy in the static potential). The transport is spin-polarized and depends sensitively on the orientation of the altermagnet relative to the interface. Compared with conventional ferromagnetic and antiferromagnetic mechanisms, the transmission in our system presents alternating zero or nonzero net magnetization. These orientation-dependent transport characteristics highlight the unique nature of the altermagnetic state.

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• Altermagnetism
• Magnetism
• Photoinduced effect
• Transport phenomena
• Altermagnets