Yang-Yang Lv, Lin Cao, Shuang Han, Ye-Cheng Luo, Jian Zhou, Ming-Hui Lu, Ye Xiong, Shu-Hua Yao, Li Sheng, Faxian Xiu, Xiao-Ping Liu, Yan-Bin Chen
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引用次数: 0
摘要
体量子霍尔效应（QHE）是二维量子霍尔效应的自然延伸，是相干电子传输的代表性现象之一。然而，在具有宏观尺寸的真实材料中，很少有关于体量子霍尔效应的报道。在这里，我们报告了在由纳米级薄片组成的毫米级和纳米级结构的宏观 TaP 晶体中的新型体量 QHE。具体来说，我们在横向电阻率 ρxy 和垂直电阻率 ρzz 中同时观察到了量子高原。体质量子高能效应可归因于磁场 B 作用下的朗道回旋运动与纳米尺度薄片所产生的周期性调制电势之间的协同作用。这种机制将分别沿垂直于 B 和平行于 B 的方向形成固定数量的边缘态，相当于堆叠的二维 QHE 层，从而导致量子化的 ρxy 和 ρzz。我们的工作验证了微结构工程可以导致电子的相干传输，并在块体材料中产生新的量子现象。
Novel Bulk Quantum Hall Effect in Nanostructured TaP Macroscopic Crystals.
Bulk quantum Hall effect (QHE), the natural extension of the two-dimensional (2D) QHE, is one of the representative phenomena of coherent electron transport. However, bulk QHE has rarely been reported in real materials with macroscopic sizes. Here, we report a novel bulk QHE in macroscopic millimeter-sized and nanostructured TaP crystals consisting of nanometer-scale lamellae. Specifically, the simultaneous quantum plateaus were observed in both transverse resistivity ρxy and vertical resistivity ρzz. The bulk QHE is attributable to synergetic action between Landau cyclotron movement under magnetic field B and periodically modulated potential due to the nanometer-scaled lamellae. This mechanism would form the fixed number of edge states along B-perpendicular and B-parallel directions respectively, equivalent to stacked 2D-QHE layers, leading to quantized ρxy and ρzz. Our work verifies that microstructure engineering could result in the coherent transport of electrons and generate new quantum phenomena in bulk materials.
期刊介绍：
Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including:
- Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale
- Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies
- Modeling and simulation of synthetic, assembly, and interaction processes
- Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance
- Applications of nanoscale materials in living and environmental systems
Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.
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