Core Insights - A new low-temperature strong magnetic field detection method has been proposed by a research team led by Shanxi University, which enhances the spatial resolution of measurements to the micrometer level, overcoming limitations of traditional methods [1][2] Group 1: Research Methodology - The existing nuclear magnetic resonance method, while precise, requires a high degree of uniformity in the magnetic field, making it ineffective in complex environments [1] - The research team utilized a "building block" approach by precisely stacking two layers of single-crystal graphene at an angle and encapsulating them with high-quality hexagonal boron nitride to create a micrometer-scale device [1] Group 2: Quantum Characteristics - Under strong magnetic fields, the developed system exhibits unique quantization features, displaying clear rhombic patterns resembling "Chinese knots" in the electrical measurement spectrum when adjusting the vertical displacement field and carrier concentration [2] - The formation of the "Chinese knot" pattern results from competition and switching between electronic states, demonstrating high stability of the quantization features [2] Group 3: New Detection Scheme - The research team proposed a novel low-temperature magnetic sensing scheme that leverages the strict linear relationship between the peak spacing of the "Chinese knot" pattern and magnetic field strength, allowing for precise magnetic field strength determination by measuring the distance between two nodes in the pattern [2] - This new scheme effectively provides a micrometer-level "ruler" for magnetic field measurement, utilizing the quantum characteristics of micro-nano devices [2]

该科研团队通过类似"搭乐高"的方式，将两层单晶石墨烯进行精确的转角堆叠，并用高质量六方氮化硼封 装，构建了微米尺度的大角度转角双层石墨烯器件。在强磁场下，该体系展现出独特的量子化特征——当调 节垂直电位移场和载流子浓度时，电学测量图谱中呈现出了一个个清晰的、类似"中国结"的菱形图案。 图为量子化"中国结"。（受访单位供图） 由山西大学主导、国内外多家单位合作的科研团队提出了一种全新的低温强磁场探测方法，突破传统测量方 法限制，将低温下强磁场测量的空间分辨率提升至微米量级，给磁场拍出高清照。相关成果于北京时间1月21 日在线发表于国际学术期刊《自然-传感》。 论文通讯作者、中国计量科学研究院研究员赵建亭表示，在低温强磁场探测领域，现有的核磁共振法虽然精 度高，但对待测磁场的均匀度有极高要求，一旦磁场环境复杂或存在梯度，测量信号就会变得模糊，新方法 则具有独特的优势。 论文第一作者、山西大学光电研究所副教授董宝娟说，新方案利用了微纳器件的量子特性，相当于给磁场测 量提供了一把微米级的"标尺"。 "传统方法在不均匀磁场中容易'失焦'，而我们的方法则能进行局域的高分辨率解析。"董宝娟表示，这一方案 应用后，有望使低温 ...