Momentum-resolved anisotropy of electronic heat capacity in gated and irradiated 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 "Momentum-resolved anisotropy of electronic heat capacity in gated and irradiated d-wave altermagnets” trên tạp chí Physica B: Condensed Matter.

Tóm tắt:

Altermagnets, which exhibit momentum-dependent spin splittings without net magnetization, offer a promising platform for anisotropic spintronics. In this work, we investigate the electronic heat capacity (EHC) of two-dimensional d-wave altermagnets under simultaneous electrostatic gating and circularly polarized light. We develop a two-band continuum model combining Rashba spin–orbit coupling — activated by dual-gate electric fields — with Floquet renormalization from high-frequency optical driving. The resulting Hamiltonian captures light-induced changes in spin gaps and the emergence of direction-dependent helical spin textures. Numerical calculations of the EHC along high-symmetry directions (T– Xand T–Y) reveal pronounced directional asymmetries: increasing light intensity reduces the low-temperature Sommerfeld coefficient and splits mid-temperature heat-capacity peaks into two features of differing amplitude. These effects intensify with stronger altermagnetic order or larger Rashba coupling, driving a crossover from Fermi-liquid to gapped, thermally activated behavior. Our results highlight gated Floquet altermagnets as a platform for directional spin-caloritronic devices operating without stray magnetic fields.