This work is devoted to the study of how spin texture excitations are affected by the presence of a static nonmagnetic impurity whenever they lie on a conical support. We realize a number of novelties as compared to the flat plane case. Indeed, by virtue of the conical shape, the interaction potential between a soliton and an impurity appears to become stronger as long as the cone is tighten. As a consequence, a new kind of solitonic excitation shows up exhibiting lower energy than in the absence of such impurity. In addition, we conclude that such an energy is also dependent upon conical aperture, getting lower values as the latter is decreased. We also discuss how an external magnetic field (Zeeman coupling) affects static solitonic textures, providing instability to their structure.
We have performed a systematic investigation of the nature of the nontrivial interface states in topological/normal insulator (TI/NI) heterostructures. On the basis of first principles and a recently developed scheme to construct ab initio effective Hamiltonian matrices from density functional theory calculations, we studied systems of realistic sizes with high accuracy and control over the relevant parameters such as TI and NI band alignment, NI gap, and spin–orbit coupling strength. Our results for IV–VI compounds show the interface gap tunability by appropriately controlling the NI thickness, which can be explored for device design. Also, we verified the preservation of an in-plane spin texture in the interface-gaped topological states.
Extensive effort has been devoted recently to develop nanoscale films of three-dimensional (3D) topological insulators, but preserving the topological state character. Usually, the surface topological states of ultra thin 3D systems are drastically affected or even suppressed due to quantum tunnelling, interactions with the substrate, as well the enlargement of the band gap due to confinement effects. Here we show that an ultra thin system composed by 2 and 3 quintuple layers of Bi2Se3 adsorbed on AlN surface present pairs of topological states with opposite spin-momentum locking. The preservation of the topological spin texture is a result of a unique combination presented in the system: a strong bond between Bi2Se3 and AlN substrate, and the enhancement of spin-orbit couplings due to a large interface potential gradient.
Embora a tradução possa ser considerada um processo de comunicação que se realiza em duas (ou três) fases, isto é, compreensão – (conceituação) – e re-expressão, a maioria dos estudos teóricos e pedagógicos tem se dedicado à compreensão e conceituação. Há, no entanto, uma necessidade crescente de estabelecer uma base teórica para a terceira fase, uma vez que, contrariamente à máxima de Boileau (de que ideias bem concebidas podem ser facilmente expressadas), mesmo quando há compreensão total, as palavras não surgem facilmente. Para que a re-expressão seja mais bem ensinada, sua avaliação precisa ser repensada. Este artigo concentra-se na avaliação da re-expressão em tradução. Com base em um estudo detalhado de vários textos escritos em inglês e traduzidos para o francês por cerca de 38 alunos do primeiro ano de um curso de Tradução, primeiramente ressalta a diferença entre expressão e re-expressão e entre criatividade e literalidade, sendo aquela vista como um “desvio” (ou afastamento) desta. Em segundo lugar, defende uma avaliação positiva (que envolve a análise de soluções bem-sucedidas, e não de erros), já que a avaliação negativa tem um impacto relativamente limitado no processo de aprendizagem e estudá-la não seria muito produtivo.
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