The flat bands in magic-angle twisted bilayer graphene (MATBG) provide an especially rich arena to investigate interaction-driven ground states. While progress has been made in identifying the correlated insulators and their excitations at commensurate moiré filling factors, the spin-valley polarizations of the topological states that emerge at high magnetic field remain unknown. Here we introduce a technique based on twist-decoupled van der Waals layers that enables measurement of their electronic band structure and-by studying the backscattering between counter-propagating edge states-the determination of the relative spin polarization of their edge modes. We find that the symmetry-broken quantum Hall states that extend from the charge neutrality point in MATBG are spin unpolarized at even integer filling factors. The measurements also indicate that the correlated Chern insulator emerging from half filling of the flat valence band is spin unpolarized and suggest that its conduction band counterpart may be spin polarized.
Introduction: The happiness and well-being of individuals are among the most important components of life. However, there remains a lack of evidence regarding the relationships between students' happiness, vigor, and self-esteem on the one hand and various complex factors on the other hand.
Methods: We conducted a cross-sectional study involving 397 students from various Lithuanian universities.
Background: Malawi ranks 142 out of 170 countries on the UN's Gender Inequality Index (GII). Women and men in Malawi have unequal access to and control over resources. Previous research has primarily examined gender roles and norms from a women's perspective, but few studies have investigated men's attitudes and behaviors regarding gender equality.
Background: The use of quality indicators in healthcare systems is one of the factors that improve the quality of health services. However, indicators for assessing HIV clinical care in the context of low- and middle-income countries are not fully explored. Some existing indicators were established within the context of developed countries and are primarily defined for community care, with limited emphasis on the hospital setting.
In the context of emphasizing on the food production, clean air guarding and sustainable development of agriculture, straw returning practices have been widely promoted, however, most studies have not linked straw returning adoption and smallholder's agricultural income in double-season rice cropping system. Based on a face-to-face survey data from 797 farmers in Jianghan Plain, Central China, we filled this gap by using the endogenous switching regression model to estimate the impact of farmer's straw returning on their agricultural income. The evidences show number of family laborers and technical training are the main factors influencing farmers' adoption of SR.
Now that it has been realized that viruses are ubiquitous, questions have been raised on factors influencing their diversity and distribution. For phytoviruses, understanding the interplay between plant diversity and virus species richness and prevalence remains cardinal. As both the amplification and the dilution of viral species richness due to increasing host diversity have been theorized and observed, a deeper understanding of how plants and viruses interact in natural environments is needed to explore how host availability conditions viral diversity and distributions.
