Selectable diffusion direction with topologically protected edge modes

Topological insulators provide great potentials to control diffusion phenomena as well as waves. Here, we show that the direction of thermal diffusion can be selected by the contributions of the topologically protected edge modes via the quantum spin Hall effect in a honeycomb-shaped structure. We demonstrate that when we set our structure to the temperature corresponding to the type of edge mode, the direction of thermal diffusion can be tuned. Moreover, this diffusion system is found to be immune to defects owing to the robustness of topological states. Our work points to exciting new avenues for controlling diffusion phenomena.Comment: 8 pages, 5 figure

Selectable diffusion direction with topologically protected edge modes

Abstract Topological insulators provide great potential to control diffusion phenomena as well as waves. In addition to the thermal localization and robust decay as reported, the topological edge states with higher degree of freedom offers a route to control directional diffusion. Here, we show that the direction of thermal diffusion can be selected by the contributions of the topologically protected edge modes in a honeycomb-shaped structure. Considering the thermal diffusion between the nearest neighboring sites of the honeycomb-shaped unit cells, the cells allow unidirectional heat balance from a macroscopic perspective when we set the structure to the temperature corresponding to the edge mode type. Moreover, this diffusion system is found to be immune to defects owing to the robustness of topological states. Our work points to exciting avenues for controlling diffusion phenomena

Prospective Clinical Evaluation of the Serologic Tuberculous Glycolipid Test in Combination with the Nucleic Acid Amplification Test

We have conducted a prospective controlled multicenter study to evaluate differences in the levels of clinical utility of the tuberculous glycolipid (TBGL) serodiagnostic test and the nucleic acid amplification test in patients with smear-negative active pulmonary tuberculosis (TB). The TBGL test and the PCR test were individually not so useful for the rapid diagnosis of smear-negative active pulmonary TB. However, clinical utility was considerably improved by using the TBGL test and the PCR test in combination, especially in patients with smear-negative and culture-negative active pulmonary TB and in patients with minimally advanced lesions

水中アーク放電アルゴンプラズマに関する諸特性評価

Characteristic of Argon arc plasma in water is not understood well. We built an experimental setting and generated argon arc plasma immersed into the water.Generated arc plasma can be observed directly because quartz window is attached to side chamber wall. Therefore we can utilize OES (Optical Emission Spectroscopy) method to lead excitation temperature and electron density at the same time. One advantage of OES is that plasma is not disturbed by measuring equipment like electrode probe. Voltage-Current characteristic is important parameter in case of argon arc plasma. Therefore, we set current as parameter. Finally we evaluated excitation temperature and electron density regarding to water existence.identifier:oai:t2r2.star.titech.ac.jp:5036795