Koller, Sonja and Mayrhofer, Leonhard and Grifoni, Milena (2007) Spin transport across carbon nanotube quantum dots. NEW JOURNAL OF PHYSICS, 9: 348. ISSN 1367-2630,
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We investigate linear and nonlinear transport in interacting single-wall carbon nanotubes ( SWCNTs) that are weakly attached to ferromagnetic leads. For the reduced density matrix of a SWCNT quantum dot, equations of motion which account for an arbitrarily vectored magnetization of the contacts are derived. We focus on the case of large diameter nanotubes where exchange effects emerging from short- ranged processes can be excluded and the four- electron periodicity at low bias can be observed. This yields in principle four distinct resonant tunnelling regimes, but due to symmetries in the involved groundstates, each two possess a mirror- symmetry. With a non-collinear configuration, we recover at the 4N <-> 4N +/- 1 resonances the analytical results known for the angular dependence of the conductance of a single level quantum dot or a metallic island. The two other cases are treated numerically and show on the first glance similar, yet not analytically describable dependences. In the nonlinear regime, negative differential conductance features occur for non-collinear lead magnetizations.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRON-SPIN; WIRES; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 01 Dec 2020 11:18 |
| Last Modified: | 01 Dec 2020 11:18 |
| URI: | https://pred.uni-regensburg.de/id/eprint/32193 |
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