Search

Searching for multiferroic materials with ferromagnetic (FM) and ferroelectric (FE) properties holds promise for ultra‐high‐density and low‐energy‐consumption memory device applications, but 2D materials with both properties are rare. Herein, a general strategy to achieve nonvolatile electric field control of magnetism in the bilayer (BL) α‐In2Se3 by hole doping is proposed. By first‐principles calculations, it is demonstrated that hole doping can induce robust ferromagnetism in the bilayer α‐In2Se3 due to its unique flat Mexican‐hat‐shape valence band structure. Such band edges cause van Hove singularities (VHS), and proper hole doping can lead to time‐reversal symmetry breaking. The bilayer α‐In2Se3 exhibits ferromagnetism and ferroelectricity within a wide range of doping concentrations, resulting in an unexpected multiferroic phase. Furthermore, when the electrical polarization of α‐In2Se3 flips from downward to upward, it becomes non‐magnetic (NM) from ferromagnetic states in the As‐substituted bilayer α‐In2Se3, which can work as a nonvolatile magnetic storage unit. Remarkably, the As‐substituted bilayer α‐In2Se3 exhibits an enhanced magnetic moment of 1.2 μB per AsSe due to substantial charge transfer across the interface. Notably, the mechanism of electrically controlled magnetism is elucidated as the coupling among the Mexican‐hat‐like dispersion, ferromagnetism, and ferroelectricity. The findings offer a promising strategy for electrical writing and the magnetic reading memory device. [ABSTRACT FROM AUTHOR]

In this study, I consider the practice of sharenting mixed-blood children on Douyin as a particular case to explore how a racialized discourse facilitates and complicates the mechanism of sharenting in the Chinese context. Through digital ethnography and a qualitative content analysis of short video and audience comments on selected hunxue'er accounts, I explore how three racialized sharenting strategies – performances of Eurasianness, Chineseness, and cosmopolitanism, built around the concept of hunxue, or mixed-blood, are in fact forms of racialized digital labor for increasing visibility and monetizing creativity. The findings demonstrate that through a seemingly agentic and definitely conscious play of mixed identities, these sharenting strategies, exclusive to hunxue'er accounts, justify a distinctive use of children's digital labor in Chinese society. This study also shows that in Douyin's landscape, sharenting children from Chinese-Caucasian families appears to be more visible and favored, which not only reveals the insidious logic of global racial hierarchies but also reinforces the structures of dominance in the digital sphere. [ABSTRACT FROM AUTHOR]

This study investigates how China’s COVID-19 prevention policy during the pandemic affected the physical and mental well-being of Chinese students overseas returning home, and how their perceptions of ‘home’ were both challenged and reinforced through their interactions with China’s virus prevention and control measures. We first review the literature on the vulnerability of transnational students during the pandemic, with a focus on transnational Chinese students. Then we explore the concept of ‘homing’ within the context of China’s cultural definition of ‘roots’ (gen, 根). Drawing from participant narratives, we identified three interwoven themes highlighting challenges faced during their journey home – reconnecting with cultural roots, negotiating with critical institutions, and struggling with in-between identities, and analysed their relationships with their health identity and the concept of home. Our findings offer practical insights for improving the well-being of these transnational migrants during times of crisis. [ABSTRACT FROM AUTHOR]

The kagome lattice is one of the most intriguing topics to study. It has a frustrated flat band touching a set of Dirac bands and can possess various promising properties, such as ferromagnetism, superconductivity, and a non-trivial topology. Covalent organic frameworks (COFs) are a rare type of inorganic material, however, they can provide a platform for generating certain required lattices. Based on first-principles density functional theory calculations, we show that a newly synthesized two-dimensional COF named COF-SH has novel enantiomorphic kagome bands, which include two sets of flat bands touching the Dirac bands around the Fermi level. The Bloch wave of the flat-valence band at the K-point shows the kagome nature of the phase interference. Under charge doping, the COF-SH exhibits a ferromagnetic ground state. Moreover, when COF-SH is doped with iodine atoms, a sizable gap in the system is opened between the flat bands and the Dirac bands due to the spin–orbit coupling (SOC) effect. Meanwhile, the spin degeneracy is lifted since the organic layer loses electrons due to the oxidizing property of iodine. In addition, our tight-binding analysis with the SOC effect shows that the flat valence band separates from the Dirac bands and holds a nonzero Chern number. Consequently, this I-doped COF can give rise to a quantum anomalous Hall effect. [ABSTRACT FROM AUTHOR]