2024-03-28T09:40:22Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00007160
2023-01-16T03:52:39Z
336:695:696
Ground-state properties of quantum rings with a few electrons: Magnetization, persistent current, and spin chirality
Saiga, Y.
19368
Hirashima, D.S.
19369
Usukura, J.
19370
Ground-state properties of one-dimensional quantum rings with a few electrons, which interact with each other in the form of 1/ r Coulomb repulsion, are studied by exact diagonalization. For three electrons, the fully spin-polarized ground state is uniquely realized when the diameter of the ring is sufficiently large. In contrast, for four and five electrons, the fully polarized state never becomes the unique ground state, however large the diameter is. These results can be understood in terms of the multiple-spin exchange. When a perpendicular magnetic field is applied to the ring (i.e., the Aharonov-Bohm flux is introduced), the persistent current occurs, and the spin chirality is finite for a certain value of the flux. The difference between the quantum ring and the circularly arranged quantum dots is also discussed.
journal article
American Physical Society
2007-04
application/pdf
PHYSICAL REVIEW B
4
75
045343
045343
http://hdl.handle.net/2237/8835
1098-0121
https://nagoya.repo.nii.ac.jp/record/7160/files/PhysRevB_75-045343.pdf
eng
https://doi.org/10.1103/PhysRevB.75.045343
Copyright: American Physical Society, All rights reserved.