 Wysłany: Pią 10:04, 18 Lut 2011 Temat postu: |
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| In recent years, the field of topological insulators has become the most popular topics of physics, one of the topological insulator materials can be also used as insulators and conductors, because of its internal structure to prevent the current flow through the edges and the surface was able to ensure the current campaign.
The most important topological insulator surface may be spin polarized electron motion can be guaranteed, while energy consumption is also prevented when the electronic dispersion. In the "Nature Nanotechnology" magazine, from the University of California,strategic metal supplier, Los Angeles (UCLA), the Engineering and Applied Science and University of Queensland researcher at the Institute of materials published, showing the topological insulator bismuth telluride surface conduction channel, shows the insulator surface Fermi level according to the location of surface states to regulate the transmission performance. Bismuth Telluride is known for its thermoelectric properties, and because of its unique surface state is presumed to be three topological insulator. For bismuth telluride recently carried out some experiments of bulk material also shows that the surface state with two transmission channels. But this small band gap semiconductor and the thermal excitation of other causes of insufficient purity of the important scattering also makes the adjustment of the surface conductive features as a great challenge. The topology of the development of insulated nano-technology has made in this supplement. The great degree of compaction of nano materials,niobium, surface conditions, making the total force can be controlled by the surface state. Wang and his team used nano-materials as bismuth telluride crystal structure of the conduction channel field effect. This depends on the external electric field to control the Fermi level, to regulate the transmission channel state,niobium supplier, the highest conductivity can reach 51%. The researchers did the first time, show the possibility of regulating the surface of topological insulators. Source: http://www.mhcmm.com |
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| Wysłany: Pią 4:30, 18 Lut 2011 Temat postu: 女艺人照片 |
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| 女艺人照片被盗用称是天上人间陪侍小姐
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