Pfaller, Sebastian and Donarini, Andrea and Grifoni, Milena (2013) Subgap features due to quasiparticle tunneling in quantum dots coupled to superconducting leads. PHYSICAL REVIEW B, 87 (15): 155439. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
We present a microscopic theory of transport through quantum dot setups coupled to superconducting leads. We derive amaster equation for the reduced density matrix to lowest order in the tunneling Hamiltonian and focus on quasiparticle tunneling. For high enough temperatures transport occurs in the subgap region due to thermally excited quasiparticles, which can be used to observe excited states of the system at low bias voltages. On the example of a double quantum dot we show how subgap transport spectroscopy can be done. Moreover, we use the single level quantum dot coupled to a normal and a superconducting lead to give a possible explanation for the subgap features observed in the experiments of Dirks, Chen, Birge, and Mason [Appl. Phys. Lett. 95, 192103 (2009)].
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ANDREEV BOUND-STATES; TRANSPORT; JOSEPHSON; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Apr 2020 07:50 |
| Last Modified: | 16 Apr 2020 07:50 |
| URI: | https://pred.uni-regensburg.de/id/eprint/16798 |
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