arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.04390cond-mat.mes-hallcond-mat.supr-conquant-ph
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有限尺寸介观环中的量子干涉

Quantum interference in finite-size mesoscopic rings

G. P. Papari, V. M. Fomin

摘要:

采用Ginzburg-Landau理论模拟有限尺寸介观环的序参量,研究屏蔽电流的起始对入射电流输运的影响。磁通量通过在环中循环的抗磁和顺磁超电流上的诱导空间排序来打破输入和输出短截线之间的电流的对称性。这些屏蔽电流的分布驱动输入/输出的超电流的干扰,导致电阻作为磁通量的函数的正弦变化,即使准粒子的密度不被外部磁场修改。

英文摘要:

The Ginzburg-Landau theory is used to model the order parameter of a finite-size mesoscopic ring to investigate the effects of the onset of screening currents on the transport of incoming ones. The magnetic flux breaks the symmetry of currents between input and output stubs by means of an induced spatial ordering upon diamagnetic and paramagnetic supercurrents circulating in the ring. The distribution of those screening currents drives the interference of incoming/outgoing supercurrents resulting into a sinusoidal variation of resistance as a function of the magnetic flux even if the density of quasiparticles is not modified by the external magnetic field.

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