Leumer, Nico and Grifoni, Milena and Muralidharan, Bhaskaran and Marganska, Magdalena (2021) Linear and nonlinear transport across a finite Kitaev chain: An exact analytical study. PHYSICAL REVIEW B, 103 (16): 165432. ISSN 2469-9950, 2469-9969
Full text not available from this repository.Abstract
We present exact analytical results for the differential conductance of a finite Kitaev chain in an N-S-N configuration, where the topological superconductor is contacted on both sides with normal leads. Our results are obtained with the Keldysh nonequilibrium Green's function technique, using the full spectrum of the Kitaev chain without resorting to minimal models. A closed formula for the linear conductance is given, and the analytical procedure to obtain the differential conductance for the transport mediated by higher excitations is described. The linear conductance attains the maximum value of e(2)/h only for the exact zero-energy states. Also, the differential conductance exhibits a complex pattern created by numerous crossings and anticrossings in the excitation spectrum. We reveal the crossings to be protected by inversion symmetry, while the anticrossings result from a pairing-induced hybridization of particlelike and holelike solutions with the same inversion character. Our comprehensive treatment of the Kitaev chain allows us also to identify the contributions of both local and nonlocal transmission processes to transport at arbitrary bias voltage. Local Andreev reflection processes dominate the transport within the bulk gap and diminish for higher excited states but reemerge when the bias voltage probes the avoided crossings. The nonlocal direct transmission is enhanced above the bulk gap but contributes also to the transport mediated by the topological states.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MAJORANA QUASI-PARTICLES; STATE |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 Aug 2022 08:42 |
| Last Modified: | 10 Aug 2022 08:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/46268 |
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