arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0906.4780cond-mat.mes-hallcond-mat.dis-nn
收藏

正常金属环中的持续电流:高精度实验与理论的比较

Persistent currents in normal metal rings: comparing high-precision experiment with theory

A. C. Bleszynski-Jayich, W. E. Shanks, B. Peaudecerf, E. Ginossar, F. von Oppen, L. Glazman, J. G. E. Harris

摘要:

量子力学预言电阻电路的平衡态包含无耗散电流。这种持续的电流一直是相当多的理论和实验工作的焦点,但其基本性质仍然是一个有争议的话题。研究持续电流的主要实验挑战是它们产生的小信号及其对环境的异常敏感性。为了解决这些问题,我们已经开发了一种新的技术,用于检测持续电流,它提供了大大提高的灵敏度和减少测量反作用。这使我们能够在比以前更宽的温度、环尺寸和磁场范围内测量金属环中的持续电流。我们发现,测量一个单一的环和阵列的环同意与计算的基础上的非相互作用的电子模型。

英文摘要:

Quantum mechanics predicts that the equilibrium state of a resistive electrical circuit contains a dissipationless current. This persistent current has been the focus of considerable theoretical and experimental work, but its basic properties remain a topic of controversy. The main experimental challenges in studying persistent currents have been the small signals they produce and their exceptional sensitivity to their environment. To address these issues we have developed a new technique for detecting persistent currents which offers greatly improved sensitivity and reduced measurement back action. This allows us to measure the persistent current in metal rings over a wider range of temperature, ring size, and magnetic field than has been possible previously. We find that measurements of both a single ring and arrays of rings agree well with calculations based on a model of non-interacting electrons.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑