Persistent current in superconducting nanorings.
نویسندگان
چکیده
The superconductivity in very thin rings is suppressed by quantum phase slips. As a result, the amplitude of the persistent current oscillations with flux becomes exponentially small, and their shape changes from sawtooth to a sinusoidal one. We reduce the problem of low-energy properties of a superconducting nanoring to that of a quantum particle in a sinusoidal potential and show that the dependence of the current on the flux belongs to a one-parameter family of functions obtained by solving the respective Schrödinger equation with twisted boundary conditions.
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ورودعنوان ژورنال:
- Physical review letters
دوره 89 9 شماره
صفحات -
تاریخ انتشار 2002