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Controlling the Pauli spin susceptibility of altermagnets via gating and optical driving

Chúc mừng GS.TS. Trần Công Phong công bố công trình nghiên cứu trên tạp chí quốc tế uy tín Journal of Magnetism and Magnetic Materials

Viện Công nghệ tiên tiến (IAST), Trường Đại học Tôn Đức Thắng, xin gửi lời chúc mừng đến GS.TS. Trần Công Phong về công bố quốc tế mới nhất trên Journal of Magnetism and Magnetic Materials.

Bài báo có tựa đề: Controlling the Pauli spin susceptibility of altermagnets via gating and optical driving

Abstract: Altermagnets, characterized by symmetry-protected momentum-dependent spin splittings without net magnetization, enable anisotropic spintronics through structured Fermi surfaces and tunable electronic responses. Here, we theoretically investigate the Pauli spin susceptibility in gated and circularly polarized light-driven two-dimensional 𝑑-wave altermagnets. We employ a two-band continuum model that incorporates gate-induced Rashba spin–orbit coupling and high-frequency Floquet renormalization. The effective Hamiltonian captures photo-dressed spin gaps and anisotropic helicities, with the inverse Faraday exchange parameter quantifying light-induced susceptibility modulations. Numerical evaluation along high-symmetry directions reveals profound tunability: for benchmark altermagnetic strength and modest Rashba coupling, varying the photoexchange suppresses low-temperature Pauli plateaus, inducing Curie-like tails and directional anisotropies from Floquet order. Strengthening the altermagnetic or Rashba interactions transforms the system from an isotropic Pauli paramagnet into a gapped Curie regime, offering a route toward tunable, direction-selective spin functionalities.

A diagram of a band-edge state

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