The quantum Hall effect (QHE) is a fascinating quantum phenomenon that has profound implications in materials science and technology. Discovered in the early 1980s, the QHE occurs in two-dimensional electron systems subjected to strong magnetic fields at low temperatures. It has since led to significant advancements and applications in various domains. Here's how the quantum Hall effect can be utilized in materials science and technology:
1. Precision Metrology:
- The quantum Hall effect provides an exceptionally precise and accurate standard for electrical resistance. The Hall resistance in a QHE system is quantized and can be used as a fundamental reference for the metrology of electrical resistance.
- This precise quantization has been harnessed to redefine the SI unit of electrical resistance, the ohm, based on fundamental constants. This ensures the stability and accuracy of resistance standards used in industry and research.
2. Resistance Standards:
- Quantum Hall resistance standards are utilized in calibration laboratories and semiconductor industries for calibrating resistance-measuring instruments.
- These standards ....
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