倾斜磁场下Cd3As2薄膜的磁输运

IF 1.7 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

The European Physical Journal B Pub Date : 2025-06-12 DOI:10.1140/epjb/s10051-025-00969-4

Rui Min, Yi-Xiang Wang

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引用次数: 0

摘要

块状Cd3As2是一种原型狄拉克半金属，其薄膜已在最近的实验中成功制备。随后的磁输运研究揭示了一些奇特的拓扑相，如二维拓扑绝缘体相和二维Weyl半金属相。本文对Cd3As2薄膜在倾斜磁场下的磁输运特性进行了理论研究。在描述Cd3As2低能激发的有效\(k\cdot p\)模型中，我们发现当面外磁场分量较小时，每个\(n\ge 1\) LLs具有双重简并性，霍尔平台呈现奇数序列；当面外分量增加时，LLs间距增大，打破了LLs的二次简并，导致了霍尔高原的整数序列。因此，我们的工作可以捕捉到实验中观察到的倾斜角度驱动的霍尔平台转换的主要物理原理。图形摘要

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Magnetotransport of Cd3As2 thin films under a tilted magnetic field

The bulk Cd₃As₂ is a prototype Dirac semimetal and its thin films have been successfully fabricated in recent experiments. The subsequent magnetotransport studies revealed several exotic topological phases, such as two-dimensional (2D) topological insulator phase and 2D Weyl semimetal phase. Here, we make a theoretical study on the magnetotransport properties of Cd₃As₂ thin films under a tilted magnetic field. Within the effective \(k\cdot p\) model describing the low-energy excitations in Cd₃As₂, we find that when the out-of-plane magnetic field component is small, each \(n\ge 1\) LLs own the twofold degeneracy, and the Hall plateau shows the odd-integer sequence; when the out-of-plane component increases, the LL spacings get enlarged, which breaks the twofold degeneracy of the LLs and leads to the integer sequence of the Hall plateaus. Therefore, our work could capture the main physics underlying the tilt angle-driven Hall plateau transitions that are observed in the experiment.