期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 77, 期 8, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.77.084711
关键词
multilayer Dirac electron system; negative magnetoresistance; zero-mode; zero gap conductor; quasi-two-dimensional conductor; organic conductor; alpha-(BEDT-TTF)(2)I-3; interlayer magnetotransport; tunneling picture
资金
- Ministry of Education. Culture, Sports, Science, and Technology [15073206, 16076206, 17072004, 19340095]
- Grants-in-Aid for Scientific Research [16076206, 15073206, 17072004, 19340095] Funding Source: KAKEN
The interlayer magnetotransport has been considered in multilayer Dirac electron systems, in which two-dimensional electron layers with Dirac-cone dispersion stack with weak interlayer coupling. Under magnetic fields, one Landau level (zero-mode) always appears at the contact point of Dirac cones, and tunneling between the zero-modes on neighboring layers dominates interlayer transport in multilayer systems. The increase of zero-mode degeneracy causes strong negative magnetoresistance. Spin splitting of the zero-mode could change the negative magnetoresistance to the positive one in high magnetic fields and low temperatures. The magnetotransport features observed in an organic conductor alpha-(BEDT-TTF)(2)I-3 are discussed based on the present model.
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