Please use this identifier to cite or link to this item: https://physrep.ff.bg.ac.rs/handle/123456789/509
Title: Spin ordering in RKKY nanowires: Controllable phases in C 13 nanotubes
Authors: Lazić, Nataša 
Damnjanović, Milan 
Issue Date: 26-Nov-2014
Journal: Physical Review B - Condensed Matter and Materials Physics
Abstract: 
Detailed study of nuclear spin order in semiconducting 13°C nanotubes reveals subtle interplay of the chemical potential, length, diameter, and chirality, resulting in the complex four-dimensional phase diagram of the helical ground states. Increase of the chemical potential causes abrupt transitions between different helical spin orderings of three regimes which are interpolated by a smooth change of helical angle within each regime: in the middle one the helimagnet is a deviation from the commensurate order and fully characterizes the geometry of the nanotube, while outside it the ground state is an incommensurate helical deviation from the ferromagnet. This behavior of the 13°C nanotubes manifests the long-range of the RKKY interaction and quasi-one-dimensional geometry, thus being universal for all RKKY interaction governed nanowires. Short enough nanotubes are ferromagnetic; the critical length when frustration arises decreases with the chemical potential but increases with diameter and chiral angle. The results, verified numerically, show that with nanotubes of the different but realistic lengths, various scenarios of the helical order response to the gate voltage can be achieved.
URI: https://physrep.ff.bg.ac.rs/handle/123456789/509
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.90.195447
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