Continuously Tunable Charge in Andreev Quantum Dots
介观与纳米尺度物理
2009-11-11 v2 超导电性
摘要
We show that a quantum dot connected via tunnel barriers to superconducting leads traps a continuously tunable and hence fractional charge. The fractional charge on the island is due to particle-hole symmetry breaking and can be tuned via a gate potential acting on the dot or via changes in the phase difference across the island. We determine the groundstate, equilibrium, and excitation charges and show how to identify these quantities in an experiment.
引用
@article{arxiv.cond-mat/0610180,
title = {Continuously Tunable Charge in Andreev Quantum Dots},
author = {I. A. Sadovskyy and G. B. Lesovik and G. Blatter},
journal= {arXiv preprint arXiv:cond-mat/0610180},
year = {2009}
}
备注
5 pages, 2 Postscript figures; minor corretions