期刊
NPJ QUANTUM MATERIALS
卷 7, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41535-022-00470-6
关键词
-
类别
资金
- Japan by JSPS KAKENHI [17K05556, 22H04485, 22K03537]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences [2015187]
- National Science Foundation [DMR-1644779]
- State of Florida
In this study, the resistivity and conductivity were measured in CaFeAsF, and the emergence of the nu = 0 quantum Hall state was observed under high magnetic field strengths.
CaFeAsF is an iron-based superconductor parent compound whose Fermi surface is quasi-two dimensional, composed of Dirac-electron and Schrodinger-hole cylinders elongated along the c axis. We measured the longitudinal and Hall resistivities in CaFeAsF with the electrical current in the ab plane in magnetic fields up to 45 T applied along the c axis and obtained the corresponding conductivities via tensor inversion. We found that both the longitudinal and Hall conductivities approached zero above similar to 40 T as the temperature was lowered to 0.4 K. Our analysis indicates that the Landau-level filling factor is nu = 2 for both electrons and holes at these high field strengths, resulting in a total filling factor nu = nu(hole) - nu(electron) = 0. We therefore argue that the nu = 0 quantum Hall state emerges under these conditions.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据