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A comparison of magnetoconductivities between type-I and type-II Weyl semimetals
| Title: | A comparison of magnetoconductivities between type-I and type-II Weyl semimetals |
| Authors: | Morishima, Kazuki Browse this author | | Kondo, Kenji Browse this author →KAKEN DB |
| Issue Date: | 28-Mar-2021 |
| Publisher: | American Institute of Physics (AIP) |
| Journal Title: | Journal of Applied Physics |
| Volume: | 129 |
| Issue: | 12 |
| Start Page: | 125104 |
| Publisher DOI: | 10.1063/5.0039554 |
| Abstract: | It is well known that Weyl semimetals (WSMs) are classified into two types of type-I and type-II depending on whether or not they have electron and hole pockets. Also, these WSMs have peculiar transport properties such as negative longitudinal magnetoresistance and planar Hall effect because of a chiral anomaly. In this paper, however, we show that the chiral anomaly can cause positive longitudinal magnetoresistance in type-II WSMs. Here, we investigate longitudinal and transverse magnetoconductivities of time reversal symmetry broken type-I and type-II WSMs using a tight-binding model. The model allows us to describe both types of type-I and type-II WSMs by tuning parameters, and it has two Weyl points that are separated along the k x-direction. The numerical calculations of these conductivities are performed using the Boltzmann equation including the Berry curvature. It is found that longitudinal magnetoconductivities in the x-direction can have both positive and negative values depending on the magnitude of the inclination of a Weyl cone. This is because the zeroth Landau energy-level becomes either a hole-like one or an electron-like one depending on the magnitude of the inclination of the Weyl cone in type-II WSMs. These results imply that we can make a high MR-ratio device using type-II WSMs by tuning the inclination of their cones if it is possible to change their energy bands by the application of electric field and so on. |
| Rights: | This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in (K. Morishima and K. Kondo , "A comparison of magnetoconductivities between type-I and type-II Weyl semimetals", Journal of Applied Physics 129, 125104 (2021) https://doi.org/10.1063/5.0039554) and may be found at (https://doi.org/10.1063/5.0039554). |
| Type: | article |
| URI: | http://hdl.handle.net/2115/84729 |
| Appears in Collections: | 電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 近藤 憲治
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