巧打“中国结”，给磁场拍高清照

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]