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TRANSPORT IN JOSEPHSON JUNCTION WITH TIME DELAY AND COUPLING BETWEEN NOISE TERMS

DAN WU

School of Physical Science and Technology, Suzhou University, Suzhou, Jiangsu 215006, People's Republic of China

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and

SHIQUN ZHU

School of Physical Science and Technology, Suzhou University, Suzhou, Jiangsu 215006, People's Republic of China

Corresponding author.

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https://doi.org/10.1142/S0217979210056049Cited by:1 (Source: Crossref)

Abstract

The transport of a spatially periodic system with time delayed feedback driven by coupled noise terms is investigated. A general approximate equation of the current is derived. For the superconduction Josephson junction, it is found that suitable time delay can enhance the current in the system. In the presence of the coupling between noise terms, the current direction is determined by the sign of the coupling. The negative coupling can induce positive current, while the positive coupling can induce negative current. The absolute value of the current is a peaked function of the additive noise but a monotonically increasing function of the multiplicative noise. Numerical simulations are in good agreement with the approximate theoretical results.

Keywords:

PACS: 05.60.Cd, 05.40.-a, 05.45.-a

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