Linyu Cao

Keywords topological spin configuration meron chain Lorentz TEM van der Waals ferromagnet Introduction Topological vortex-like structures, such as skyrmions,1,2,3 skyrmioniums,4,5 and (anti)merons,6,7 have attracted enormous interest in the spintronics community.8,9,10,11 These structures possess distinct topological characteristics and intriguing transport properties promising for future applications in magnetic storage devices.4,12,13,14,15 Recent observations of topological textures in...

1. Introduction For investors aiming to maximize profits while minimizing risk, portfolio optimization has long been recognized as an effective strategy and is one of the major research topics in the financial field [1,2]. This paper focuses on selecting appropriate investment assets and allocating investors’ wealth across various assets, thus creating a productive investment strategy for investors.

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