标题： 叠层依赖的反向双层铁性：反铁磁性还是铁电性 显示英文标题

标题： Stacking-dependent ferroicity of reversed bilayer: altermagnetism or ferroelectricity

摘要： 反铁磁性作为一门独立于传统铁磁性和反铁磁性的新磁学分支，最近引起了广泛关注。 目前，研究人员已经证明了几种三维反铁磁体，但对二维（2D）反铁磁体的研究仍然难以捉摸。 在此，我们提出了一种在二维晶格中设计反铁磁性的方法：双层反转堆叠。 这种方法可以使反铁磁性类型的自旋分裂内在地发生，并且自旋分裂可以通过晶体手性进行控制。 我们还通过一种具有AB'堆叠顺序的双层PtBr$_3$实际材料进行了验证。 此外，堆叠顺序与滑动电子学的结合为电子器件的电写入和磁读取提供了新的机会。 在AC'堆叠的情况下，层间滑动导致可逆的自发极化。 这种反铁磁性和滑动铁电性的独特组合导致了由极化控制的自旋分裂，从而实现了磁电耦合，即使没有净磁化，也可以通过磁光Kerr效应检测到。 我们的研究强调，反转堆叠提供了一个平台，以探索磁性、铁电性和自旋分裂丰富的物理特性。 显示英文摘要

摘要： Altermagnetism, as a new branch of magnetism independent of traditional ferromagnetism and antiferromagnetism, has attracted extensive attention recently. At present, researchers have proved several kinds of three-dimensional altermagnets, but research on two-dimensional (2D) altermagnets remains elusive. Here, we propose a method for designing altermagnetism in 2D lattices: bilayer reversed stacking. This method could enable altermagnetism-type spin splitting to occur intrinsically and the spin-splitting can be controlled by crystal chirality. We also demonstrate it through a real material of bilayer PtBr$_3$ with AB' stacking order. Additionally, the combination of stacking order and slidetronics offers new opportunities for electrical writing and magnetic reading of electronic devices. In the case of AC' stacking, interlayer sliding results in reversible spontaneous polarization. This unique combination of antiferromagnetism and sliding ferroelectricity leads to polarization-controlled spin-splitting, thus enabling magnetoelectric coupling, which can be detected by magneto-optical Kerr effect even without net magnetization. Our research highlights that reversed stacking provides a platform to explore rich physical properties of magnetism, ferroelectricity, and spin-splitting.