One-dimensional p-wave superconductor toy-model for Majorana fermions in multiband semiconductor nanowires

Majorana fermions are particles identical to their antiparticles proposed theoretically in 1937 by Ettore Majorana as real solutions of the Dirac equation. Alexei Kitaev suggested that Majorana particles should emerge in condensed matter systems as zero mode excitations in one-dimensional p-wave superconductors, with possible applications in quantum computation due to their non-abelian statistics. The search for Majorana zero modes in condensed matter systems led to one of the first realistic models based in a semiconductor nanowire with high spin-orbit coupling, induced superconducting s-wave pairing and Zeeman splitting. Soon, it was realized that size-quantization effects should generate subbands in these systems that could even allow the emergence of more than one Majorana mode at each edge, resulting in a zero bias peak on the differential conductance with a different shape from the predicted by simplified theoretical models. In this work, we provide a connection between a finite-size nanowire with two occupied subbands and a 2-band Kitaev chain and discuss the advantage of an one-dimensional model to understand the phenomenology of the system, including the presence of a hidden chiral symmetry and its similarity with a spinfull Kitaev chain under a magnetic field.Comment: 4 pages, 2 figures. IEEE Transactions on Applied Superconductivity accepted versio

O Uso das Plataformas de Redes Sociais como Instrumento de Vendas: o caso dos negócios baseados em gastronomi

The use of social networks by small and medium entrepreneurs (SMEs) is becoming increasingly frequent, mainly due to the opportunity to advertise and sell their products on the platforms. This study aims to understand how SMEs in the food industry use social media platforms to increase the sales potential of their businesses. The analysis was performed from exploratory case studies, and the study objects were four SMEs in the food industry. Data collection allowed to analyze how SMEs developed – or not – a strategy for the use of social networks and the resulting impacts. From the results, it can be concluded the importance that the elaboration and implementation of a strategy for the use of social networks has on the growth of sales

Corporate Governance in Times of Social Networking Sites: an analysis of corporate communications from companies of “New Market” tier at the Brazilian Stock Exchange (B3)

Investors have broadly used social networking sites (SNS) as a mean of spreading information that they can potentially use to support investment decisions, what could imply in an issue for corporate governance (CG). This paper aims to comprehend how Brazilian public companies are using SNS for communication with investors. Therefore, we have developed qualitative research, using data from 146 companies with the highest CG level. Our main finding is that companies virtually do not use SNS for CG activities. This research reveals a great opportunity for companies to start developing processes, policies, and best practices to implement SNS for CG. Los inversionistas han utilizado ampliamente los sitios de redes sociales como un medio para difundir información que potencialmente pueden usar para respaldar decisiones de inversión, lo que podría implicar un problema para la gobernanza corporativa (GC). Este artículo tiene como objetivo comprender cómo las empresas públicas brasileñas están utilizando redes sociales para comunicarse con los inversionistas. Por ello, hemos desarrollado una investigación cualitativa, utilizando datos de 146 empresas con el nivel más alto de GC. Nuestro principal hallazgo es que las empresas prácticamente no utilizan redes sociales para actividades de GC. Esta investigación revela una gran oportunidad para que las empresas comiencen a desarrollar procesos, políticas y mejores prácticas para implementar redes sociales para GC. Investidores têm usado largamente as redes sociais como meio de compartilhar informações que podem potencialmente usar para subsidiar decisões de investimento, o que pode implicar em um problema para a governança corporativa. Este artigo tem como objetivo compreender como as empresas brasileiras listadas em bolsa de valores (B3) estão usando as redes sociais para se comunicar com investidores. Para tanto, desenvolvemos uma pesquisa qualitativa, usando dados de 146 empresas do mais alto nível de governança corporativa. Resultados apontaram que as empresas virtualmente não usam redes sociais para atividades de governança corporativa. Essa pesquisa revela uma grande oportunidade para empresas iniciarem o desenvolvimento de processos, políticas e melhores práticas voltadas à implementação do uso de redes sociais para a governança corporativa

Alinhando a Estrutura de Governança com a Estratégia de Inovação: Desafios e Oportunidades

The aim of this review is to contribute to the understanding of the challenges faced by companies in achieving alignment between governance structure and innovation strategy. Corporate governance is essential to ensure that companies are managed responsibly and efficiently, which can be a challenge when it comes to integrating innovation into their business strategy. The PRISMA protocol was used to systematize the results of the literature review. Based on the literature review, we can conclude that the main challenges faced by companies when trying to align their governance and innovation strategies stem from endogenous factors. It is also worth noting that the presence of top management as well as stakeholders directly involved in the process will lead to an increase in innovation. This study aims to pave the way for future research where it is possible to identify and assess innovation opportunities in a constantly changing environment

Using Social Networking Sites as Sales Strategic Tool: the case of gastronomy-based businesses

The use of social networks by small and medium entrepreneurs (SMEs) is becoming increasingly frequent, mainly due to the opportunity to advertise and sell their products on the platforms. This study aims to understand how SMEs in the food industry use social media platforms to increase the sales potential of their businesses. The analysis was performed from exploratory case studies, and the study objects were four SMEs in the food industry. Data collection allowed us to analyze how SMEs developed – or not – a strategy for the use of social networks and the resulting impacts. From the results, it can be concluded the importance of the elaboration and implementation of a strategy for the use of social networks on the growth of sales. El uso de las redes sociales por parte de los micro y pequeños empresarios es cada vez más frecuente, principalmente por la oportunidad de promocionar y vender sus productos en las plataformas. El presente estudio tiene como objetivo comprender cómo las micro y pequeñas empresas del sector de la gastronomía utilizan las plataformas de redes sociales para impulsar y aumentar el potencial de ventas de sus negocios. La técnica utilizada fue el estudio de casos múltiples, y el universo de investigación abarcó a las micro y pequeñas empresas del sector gastronómico. La recolección de datos permitió analizar cómo las micro y pequeñas empresas desarrollaron, o no, una estrategia de uso de las redes sociales y los impactos resultantes. De los resultados se puede concluir la importancia que tiene la elaboración e implementación de una estrategia para el uso de las redes sociales en el impulso de las ventas. O uso das redes sociais por micro e pequenos empreendedores vem se tornando cada vez mais frequente, principalmente pela oportunidade de divulgar e vender seus produtos nas plataformas. O presente estudo tem como objetivo compreender de que forma as micro e pequenas empresas no ramo da gastronomia utilizam as plataformas de redes sociais para impulsionar e aumentar o potencial de vendas de seus negócios. A técnica utilizada foi o estudo de casos múltiplos, sendo que o universo da pesquisa contemplou micro e pequenas empresas do setor gastronômico. A coleta de dados permitiu analisar como as micro e pequenas empresas elaboraram – ou não – uma estratégia de uso das redes sociais e quais os impactos decorrentes disso. A partir dos resultados, pode-se concluir a importância que a elaboração e implementação de uma estratégia de uso das redes sociais possuem sobre o impulsionamento das vendas