Self-Consistent Density Functional Calculation of Field Emission Currents from Metals

作     者：Y. Gohda Y. Nakamura K. Watanabe S. Watanabe 

作者机构：Department of Materials Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Corporation Japan Department of Physics Science University of Tokyo 1-3 Kagurazaka Shinjuku-ku Tokyo 162-8601 Japan 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2000年第85卷第8期

页      面：1750-1750页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

主　　题：Field emission cathodes 

摘      要：We have developed a fully self-consistent method which is suitable to examine field emission currents, on the basis of the density functional theory. In our method, the nearby counterelectrode is not necessary. By using this method, we have investigated field emission currents from a biased metallic surface represented by the jellium model. We have found that the energy barrier between the jellium and vacuum becomes lower than the Fermi energy under strong electric fields (e.g., 10 V/nm for rs=4 bohr). In this situation, the slope of the Fowler-Nordheim plot becomes flatter than that under a weaker field.