Discussion on the First Lesson in Chinese Characters Teaching to the Foreign Students

Beginning with the teaching design of the first Chinese characters lesson to foreign students, from the excitation of foreign students’ interest in Chinese characters learning, relieving their psychological fear of it, the meaning of Chinese characters learning, and establishing a correct concept of Chinese characters, step by step, the aim of this article is to help foreign students understand Chinese characters, lead the students to learn Chinese characters easily and happily, and reach the ideal teaching effect finally

Graphene-based spintronic components

A major challenge of spintronics is in generating, controlling and detecting spin-polarized current. Manipulation of spin-polarized current, in particular, is difficult. We demonstrate here, based on calculated transport properties of graphene nanoribbons, that nearly +-100% spin-polarized current can be generated in zigzag graphene nanoribbons (ZGNRs) and tuned by a source-drain voltage in the bipolar spin diode, in addition to magnetic configurations of the electrodes. This unusual transport property is attributed to the intrinsic transmission selection rule of the spin subbands near the Fermi level in ZGNRs. The simultaneous control of spin current by the bias voltage and the magnetic configurations of the electrodes provides an opportunity to implement a whole range of spintronics devices. We propose theoretical designs for a complete set of basic spintronic devices, including bipolar spin diode, transistor and logic gates, based on ZGNRs.Comment: 14 pages, 4 figure