Single molecular electrets exhibiting single molecule electric polarization switching have been long desired as a platform for extremely small non-volatile storage devices, although it is controversial because of the poor stability of single molecular electric dipoles. Here we study the single molecular device of GdC82, where the encapsulated Gd atom forms a charge center, and we have observed a gate controlled switching behavior between two sets of single electron transport stability diagrams. The switching is operated in a hysteresis loop with a coercive gate field of around 0.5Vnm. Theoretical calculations have assigned the two conductance diagrams to corresponding energy levels of two states that the Gd atom is trapped at two different sites of the C82 cage, which possess two different permanent electrical dipole orientations. The two dipole states are stabilized by the anisotropic energy and separated by a transition energy barrier of 70 meV. Such switching is then accessed to the electric field driven reorientation of individual dipole while overcoming the barriers by the coercive gate field, and demonstrates the creation of a single molecular electret.
Multiferroic van der Waals heterostructure FeCl$_2$/Sc$_2$CO$_2$: Nonvolatile electrically switchable electronic and spintronic properties
多铁性范德华（vdW）异质结构提供了一个令人兴奋的路线，对新的纳米电子学和自旋电子学器件技术。本文采用第一性原理密度泛函理论和量子输运模拟方法研究了由铁磁FeCl $_2$单层和铁电Sc $_2$ CO $_2$单层组成的多铁性VDW异质结构的电子和输运性质.研究表明，通过电调制Sc $_2$ CO $_2$的铁电极化状态，FeCl $_2$ /Sc $_2$ CO $_2$异质结构可以从半导体可逆地转变为半金属。有趣的是，半金属相表现出III型断裂带对准，这对于隧道场效应晶体管应用是有益的。我们进行了量子输运模拟，基于\emph{proof-of-concept}两端纳米器件，以证明全电控阀效应独特的非易失性铁电开关的异质结构。这些发现揭示了FeCl $_2$ /Sc $_2$ CO $_2$ vdW异质结构作为设计下一代最终紧凑的信息处理、数据存储和自旋电子器件的构建块的潜力。
Electrically switchable valley polarization, spin/valley filter, and valve effects in transition-metal dichalcogenide monolayers interfaced with two-dimensional ferromagnetic semiconductors
过渡金属二硫属化物单层中的电子谷驱动新的物理学，并允许设计多功能架构的应用。我们建议通过能带工程来操纵这些系统中的自旋/谷滤波器和阀器件的电子谷。在我们的策略中，电子谷直接耦合到二维铁磁体的自旋极化态，而不是在以前的研究中广泛使用的磁邻近效应。我们发现，这种耦合的结果在谷选择性的间隙开放，由于自旋动量锁定在过渡金属二硫属化物单层。这种物理现象引起了各种意想不到的电子性质和现象，包括半金属性，电可切换的谷极化，自旋/谷过滤器和阀效应的过渡金属二硫属化物单层。基于第一性原理计算，我们在MoTe $_2$/CoCl $_2$和CoCl $_2$/MoTe $_2$/CoCl $_2$ van der Waals异质结中进一步证明了我们的想法.因此，我们的研究提供了一种新概念器件的过渡金属二硫属化物单分子膜的电子谷工程的方法。
Altermagnets Enable Gate-Switchable Helical and Chiral Topological Transport with Spin-Valley-Momentum-Locked Dual Protection
Eastern Institute of Technology（东方理工大学）；University of Science and Technology of China（中国科学技术大学）；Suzhou University of Science and Technology（苏州科技大学）；University at Buffalo, State University of New York（纽约州立大学布法罗分校）
Engineering electrically-switchable quantum anomalous Hall states by spin-orbit coupling
Institute of Science and Technology Austria（奥地利科学技术研究院）；Rudolf Peierls Centre for Theoretical Physics, Clarendon Laboratory（鲁道夫·皮尔斯理论物理中心，克拉伦登实验室）；Research Center for Electronic and Optical Materials, National Institute for Materials Science（国家材料科学研究所电子与光学材料研究中心）；Research Center for Materials Nanoarchitectonics, National Institute for Materials Science（国家材料科学研究所材料纳米构筑学研究中心）
Ferroelectric switching of interfacial dipoles in $α$-RuCl$_3$/graphene heterostructure
Daegu Gyeongbuk Institute of Science and Technology (DGIST)（大邱庆北科学技术院）；Pohang University of Science and Technology（浦项科技大学）；Institute for Basic Science（基础科学研究院）；National Institute for Materials Science（国立材料研究所）；California Institute of Technology（加州理工学院）
