AI Article Synopsis
- The study explores how the spins of Dirac fermions on a 3D topological insulator can be controlled by a helical spin density wave, which serves as a periodic potential for spins produced by a specific type of magnet.
- The research finds that the spin values oscillate in response to this potential, and this behavior is significantly influenced by factors such as the strength, orientation, and periodicity of the magnetization.
- There is a distinction in how the spin components behave: in-plane spin values show strong oscillations due to the unique spin-momentum locking effect, while the out-of-plane component remains constant.
Article Abstract
We investigate the spin tunability of Dirac fermions on the surface of a 3D topological insulator in proximity to a helical spin density wave, acting as an applied one-dimensional periodic potential for spins produced by spiral multiferroic oxide. It is observed that the spin mean values of Dirac fermion undergo oscillations under the influence of such a periodic potential created by the exchange field of magnetization. The tunability of spin is strongly affected by the strength, orientation and period of the exchange field. In particular, the mean values of spin are anisotropic around the Dirac point, depending strongly on the amplitude and spatial period of the periodic potential. We also find that the spin expectation values change significantly by changing the plane of magnetization. Interestingly, the in-plane components of spin mean values perform pronounced oscillations, whereas the out of plane component does not oscillate at all. The oscillations of planar components of spin are originated from the spin-momentum locking on the surface of topological insulator.
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| http://dx.doi.org/10.1088/1361-648X/acebaa | DOI Listing |
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