Theory of microwave-assisted supercurrent in quantum point contacts
arXiv:1006.3181 · doi:10.1103/PhysRevLett.105.117001
Abstract
We present a microscopic theory of the effect of a microwave field on the supercurrent through a quantum point contact of arbitrary transmission. Our theory predicts that: (i) for low temperatures and weak fields, the supercurrent is suppressed at certain values of the superconducting phase, (ii) at strong fields, the current-phase relation is strongly modified and the current can even reverse its sign, and (iii) at finite temperatures, the microwave field can enhance the critical current of the junction. Apart from their fundamental interest, our findings are also important for the description of experiments that aim at the manipulation of the quantum state of atomic point contacts.
4 pages; 3 figures
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- Microwave spectroscopy of Josephson junctions in topological superconductors
- Zeeman and spin-orbit effects in the Andreev spectra of nanowire junctions
- Theory of microwave spectroscopy of Andreev bound states with a Josephson junction
- Supercurrent and Andreev bound state dynamics in superconducting quantum point contacts under microwave irradiation
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