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Efficiency of the SQUID ratchet driven by external current

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Efficiency of the SQUID ratchet driven by external current
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CC Attribution 3.0 Unported:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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2015
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English

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Abstract
We study theoretically the efficiency of an asymmetric superconducting quantum interference device (SQUID) which is constructed as a loop with three capacitively and resistively shunted Josephson junctions. Two junctions are placed in series in one arm and the remaining one is located in the other arm. The SQUID is threaded by an external magnetic flux and driven by an external current of both constant (dc) and time periodic (ac) components. This system acts as a nonequilibrium ratchet for the dc voltage across the SQUID with the external current as a source of energy. We analyze the power delivered by the external current and find that it strongly depends on thermal noise and the external magnetic flux. We explore a space of the system parameters to reveal a set for which the SQUID efficiency is globally maximal. We detect the intriguing feature of the thermal noise enhanced efficiency and show how the efficiency of the device can be tuned by tailoring the external magnetic flux.

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this week and supper conducting quantum interference device is 1 of the most important instruments found in the majority of research laboratories worldwide it has been successfully used not only for market 3 but also for testing the fundamentals of quantum mechanics as well as for investigating the chaotic complexity in classical physics yet the number of open problems of this set up still remain to be resolved a prominent example might be the efficiency of the SQUID as thermodynamical machine converting the input energy it was all the forms in contrast to a common type engine operating between 2 hits with the words with different temperatures this squeeze coupled only 1 month of fixed constant temperature we study mathematics weak
constructed as you with 3 desorption junctions 2 of them are places in 1 whereas that there is located in the other arm additionally this week is further by an external magnetic flux and driven by a time varying the current this device operates as a culture powerful in the room and rectifies that there are often deletions into their directed motion
we explore a space of the system parameters to reveal the set when the rectification efficiencies globally maximal we detect an intriguing feature of the thermalized enhanced efficiency and show how the efficiency of the device can be manipulated by tailoring the external magnetic flux moreover Our results can be readily verified experimentally without accessible set up of the a symmetric squeeze at
this point we would like to draw your attention to the
fact that our approach can also be applied to evaluate the efficiency of all the systems frequently encountered in condensed matter as well as biological physics
therefore we can encourage you to read
or alter entitled efficiency of this with Russian given by external current recently
published in the New Journal of Physics
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