Magnetoelectronic states of armchair carbon tori are studied by the tight-binding model. They strongly depend on the magnitude and the direction of the magnetic field (B). B induces the destruction of state degeneracy, the change of energy spacing, and the semiconductor-metal transition (SMT). SMT's happen more frequently when B is relatively close to the toroid axis. Such characteristics are directly reflected in magnetic properties. Magnetization (M) exhibits special jump structures at T=0, mainly owing to SMT's. Magnitude of M and magnetism are mainly determined by the toroid radius (R), the temperature, the angle (α) between the magnetic field and the symmetry axis, and the chirality. The dependence of M on radius (temperature) is strong at α=0°, but weak at α=90°. Most of armchair carbon tori are paramagnetic for α > 30°. The critical angle in determining magnetism is αc ≃ 30°. Armchair carbon tori quite differ from carbon tori near zigzag configuration (or armchair carbon nanotubes) in magnetoelectronic structures and magnetism.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2004 Aug|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics