Abstract
We investigate plasma oscillations in long electromagnetically coupled superconducting nanowires. We demonstrate that in the presence of inter-wire coupling plasma modes in each of the wires get split into two “new” modes propagating with different velocities across the system. These plasma modes form an effective dissipative quantum environment interacting with electrons inside both wires and causing a number of significant implications for the low-temperature behavior of the systems under consideration.
Highlights
Physical properties of ultrathin superconducting nanowires differ strongly from those of bulk superconductors owing to a prominent role of fluctuation effects in a reduced dimension [1-3]
In this work we have investigated plasma oscillations in capacitively coupled superconducting nanowires
We have shown that in such structures there exist two plasma modes propagating with different velocities along the wires
Summary
Physical properties of ultrathin superconducting nanowires differ strongly from those of bulk superconductors owing to a prominent role of fluctuation effects in a reduced dimension [1-3]. Fluctuation correction to the mean value of the superconducting order parameter (Equation 1) remains weak and in the majority of cases can be neglected. Such phase fluctuations are intimately related to sound-like plasma modes [6,7] (the so-called Mooij–Schön modes), which can propagate along the wire playing the role of an effective quantum dissipative environment for electrons inside the wire.
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