相关实验视频

Updated: Jul 9, 2025

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

Published on: January 21, 2016

在伯纳尔四层石墨烯四层中,可以调整门的异常霍尔效应

Hao Chen¹, Arpit Arora², Justin C W Song³

¹Department of Chemistry, National University of Singapore, Singapore, Singapore.

Nature communications

|December 1, 2023

概括

我们在稳定的伯纳尔堆叠四层石墨烯 (BTG) 装置中发现了一个异常的霍尔效应,由一个位移场驱动. 这一发现为探索易于获得的石墨烯材料中的磁性秩序开辟了新的途径.

科学领域:

凝聚物质物理学凝聚物质物理学
材料科学材料科学材料科学
纳米技术纳米技术

背景情况:

异常的霍尔效应 (AHE) 通常与强大的旋转轨道合有关.
最近的研究探讨了人工二维材料堆中的AHE,但这些往往是能量不利的.
这限制了AHE研究的实验可访问性和设备工程.

研究的目的:

调查在稳定和能量有利的石墨烯配置中观察AHE的可能性.
在这个新的材料系统中探索AHE的潜在机制和特征.
建立伯纳尔堆叠四层石墨烯 (BTG) 作为研究内在非互惠反应的可行平台.

主要方法:

伯纳尔堆叠四层石墨烯 (BTG) 装置的制造和表征.
移位场的应用来调整电子属性.
在不同的载体密度和温度下测量异常霍尔效应 (AHE).

主要成果:

在BTG中观察AHE,可通过位移场切换,在低载体密度下突出.
AHE发作的相关性与金属到断裂的同轴旋转过渡,表明铁磁的轨道起源.
在低密度下观察到非传统的歇斯底里与步形异常的霍尔高原,持续到几十个凯尔文度.

结论:

伯纳尔堆叠四层石墨烯 (BTG) 呈现出强大的异常霍尔效应 (AHE),而不依赖强大的旋转轨道合.
BTG代表了一个稳定的,易于使用的,在能源上有利的平台,用于探索磁性秩序和非互惠的传输现象.
这项工作扩大了材料的范围,在凝聚物质物理学中实现了内在的非相互反应.

更多相关视频

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

相关概念视频

The Hall Effect

The Hall Effect

Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.

π Electron Effects on Chemical Shift: Overview

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...

Biasing of Metal-Semiconductor Junctions

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...