Phys. Rev. B 75, 195334 (2007) [4 pages]Continuously tunable charge in Andreev quantum dotsReceived 19 March 2007; published 23 May 2007 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 ground state, equilibrium, and excitation charges and show how to identify these quantities in an experiment. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.195334
DOI:
10.1103/PhysRevB.75.195334
PACS:
73.21.La, 74.45.+c, 74.78.Na
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.