Generating two-dimensional ferromagnetic charge density waves via external fields

Article

关键词: ORDER;    SPECTROSCOPY;    BILAYER;   

DOI  :  10.1103/PhysRevB.106.165112

来源: SCIE

【 摘 要 】

Two-dimensional (2D) ferromagnetic charge density waves (CDWs), an exotic quantum state for exploring the intertwining effect between correlated charge and spin orders in the 2D limit, have yet to be discovered under moderate temperatures. Here, we propose a feasible strategy to realize 2D ferromagnetic CDWs under external fields, which is demonstrated in monolayer VSe2 using first-principles calculations. Under external tensile strain, ./ ./ ./ two ferromagnetic CDWs ( 3x 3 and 2x2 3 CDWs) can be generated, accompanied by distinguishable lattice reconstructions of magnetic V atoms. Remarkably, because the driving forces for generating these two ferromagnetic CDWs are strongly spin dependent, fundamentally different from that in conventional CDWs, ./ ./ ./ the 3x 3 and 2x2 3 CDWs can exhibit two dramatically different half-metallic phases under a large strain range, along with either a flat band or a Dirac cone around the Fermi level. Our proposed strategy and material demonstration may provide a feasible way to generate and manipulate the correlation effect between collective charge and spin orders via external fields.

【 授权许可】

Free