Photoinduced spin-resolved density of states in gated two-dimensional d-wave altermagnets

Chúng tôi vui mừng thông báo rằng GS.TS. Trần Công Phong và các đồng nghiệp đã xuất bản công trình có tựa đề "Photoinduced spin-resolved density of states in gated two-dimensional d-wave altermagnets” trên tạp chí Physica E: Low-dimensional Systems and Nanostructures

Tóm tắt:

Altermagnets represent a recently discovered class of magnetic materials that exhibit momentum-dependent spin splitting while retaining zero net magnetization. Their unconventional symmetry – driven by crystal anisotropies rather than spin–orbit coupling – enables tunable and direction-dependent spin textures, positioning them as promising platforms for nonrelativistic spintronics. In this work, we theoretically investigate the spin-resolved density of states (DOS) of a gated two-dimensional -wave altermagnet under Floquet optical driving. Using a minimal two-band Hamiltonian, we show that Rashba spin–orbit coupling (RSOC) and circularly polarized light act as complementary tuning parameters that reshape the electronic dispersions and DOS anisotropies. RSOC introduces helical spin textures, breaking in-plane parity and shifting van Hove singularities, while optical fields generate Floquet-induced spin gaps that further enhance anisotropic spectral features. Increasing the altermagnetic strength amplifies van Hove peaks and step-like band-edge signatures, whereas tuning RSOC and light-induced exchange potential systematically redistributes spectral weight. Our results reveal that external gating and irradiation offer dynamic and selective control of the spin-resolved DOS, opening routes toward optically tunable spin currents and Floquet-engineered spintronic devices based on altermagnets.