Navneet Kumar Karn, Yogesh Kumar, Geet Awana, Veer Pal Singh Awana
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引用次数: 0
摘要
本文研究了铋晶体在存在和不存在自旋轨道耦合(SOC)情况下的带状结构,考察了 Z2 不变量,并详细研究了铋晶体在高达 10 T(特斯拉)和低至 2 K 时随角度变化的磁传输。在 2 K 和 10 T 时,平面外磁场相关磁阻(MR)为正值,且数量级高达 ≈104%。根据横向磁场作用下电阻率与温度关系的测量结果,我们还利用波尔兹曼公式估算了热活化能。利用密度泛函理论(DFT)进行的 Z2 不变计算证实了 Bi 的拓扑性质。铋中的 PBESol 带显示出琐碎性,但混合功能(HSE)带则显示出非琐碎拓扑性。本文全面研究了磁共振振荡与外加电场和电流之间角度的关系。观察到的振荡随着角度的增大而减弱。这篇文章是我们之前关于铋的研究成果(J. Sup. Novel Mag.
Investigation of Angle‐Dependent Shubnikov‐de Haas Oscillations in Topological Insulator Bismuth
The current article investigates the band structure in the presence and absence of spin‐orbit coupling (SOC), examines the Z2 invariants, and investigates the detailed angle‐dependent magneto‐transport of up to 10 T (Tesla) and down to 2 K for the bismuth crystal. The out‐of‐plane field‐dependent magnetoresistance (MR) is positive and is huge to the order of ≈104% at 2 K and 10 T. On the contrary, the longitudinal (in‐plane) field‐dependent MR is relatively small and is negative. The thermal activation energy is also estimated by using the Boltzmann formula from resistivity versus temperature measurement under applied transverse magnetic fields. The topological nature of Bi is confirmed by Z2 invariant calculation using density functional theory (DFT). PBESol bands show trivial but hybrid functional (HSE) bands show non‐trivial topology being present in Bismuth. This article comprehensively studies the dependence of MR oscillations upon the angle between the applied field and the current. The observed oscillations fade away as the angle is increased. This article is an extension of our previous work on bismuth (J. Sup. Novel Mag. 2023, 36, 389), in which a comprehensive analysis of its structural and micro‐structural properties is conducted along with its transport behavior in an applied transverse magnetic field.
期刊介绍:
physica status solidi is devoted to the thorough peer review and the rapid publication of new and important results in all fields of solid state and materials physics, from basic science to applications and devices. Being among the largest and most important international publications, the pss journals publish review articles, letters and original work as well as special issues and conference contributions.
physica status solidi b – basic solid state physics is devoted to topics such as theoretical and experimental investigations of the atomistic and electronic structure of solids in general, phase transitions, electronic and optical properties of low-dimensional, nano-scale, strongly correlated, or disordered systems, superconductivity, magnetism, ferroelectricity etc.