报告摘要： Ferrovalley materials are systems with spontaneous valley polarization. In this work, we show a left or right twist near 30° twisted ferrovalley bilayers will change the Berry curvature of the system, which can be regarded as introducing an emergent chiral U(1) gauge field. Interestingly, this induced gauge field forms chirality dependent skyrmion pattern. Moreover, such Berry curvature change also induce the electronic polarization of the bilayer system. Therefore, the antiferromagnetically coupled twisted bilayer system is indeed also antiferroelectric due to the spin-layer locking effect. Hence, when we apply external electric field to break the potential balance between layers, there will emerge novel magnetoelectric coupling and exotic chirality dependent dielectricity. For example, the left twisted system could even demonstrate negative susceptibility, i.e. the induced polarization is opposite to the applied field, which is very rare in the nature. These findings not only enrich our understanding on Moiré systems and ferrovalley materials, but also open an appealing route toward functional 2D materials design for electronic, optical and even energy storage devices.