Ballistic magnetoresistance in small-size carbon nanotube devices
Publikation: Beitrag in Fachzeitschrift › Forschungsartikel › Beigetragen › Begutachtung
Beitragende
Abstract
We theoretically study the magnetoresistance of single wall carbon nanotubes (SWCNTs) in the ballistic transport regime, using a standard tight-binding approach. The main attention is directed to spin-polarized electrical transport in the presence of either axial or perpendicular magnetic field. The method takes into account both Zeeman splitting as well as size and chirality effects. These factors ( along with a broadening of energy levels due to a strong nanotube/electrode coupling) lead, in ultra small SWCNTs, to serious modi. cations in pro. le of the Aharonov-Bohm oscillations. Other noteworthy findings are that in the parallel configuration ( axial magnetic field) the ballistic magnetoconductance is negative ( positive) for armchair (semiconducting zigzag) nanotubes, whereas in the perpendicular configuration the magnetoresistance is nearly zero both for armchair and zigzag SWCNTs. (c) 2006 Elsevier B.V. All rights reserved.
Details
Originalsprache | Englisch |
---|---|
Seiten (von - bis) | 2439-2441 |
Seitenumfang | 3 |
Fachzeitschrift | Journal of magnetism and magnetic materials |
Jahrgang | 310 |
Ausgabenummer | 2 |
Publikationsstatus | Veröffentlicht - März 2007 |
Peer-Review-Status | Ja |
Externe IDs
Scopus | 33847649210 |
---|
Schlagworte
Schlagwörter
- Carbon nanotubes, Magnetoresistance, Spin-dependent transport