Volume 114, Number 3, May 2016
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||31 May 2016|
Electrical manipulation of dynamic magnetic impurity and spin texture of helical Dirac fermions
1 Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, ICMP and SPTE, South China Normal University - Guangzhou 510006, China
2 Laboratory of Nanophotonic Functional Materials and Devices, South China Normal University Guangzhou 510006, China
Received: 16 March 2016
Accepted: 12 May 2016
We have theoretically investigated the spin inelastic scattering of helical electrons off a high-spin nanomagnet absorbed on a topological surface. The nanomagnet is treated as a dynamic quantum spin and driven by the spin transfer torque effect. We proposed a mechanism to electrically manipulate the spin texture of helical Dirac fermions rather than by an external magnetic field. By tuning the bias voltage and the direction of impurity magnetization, we present rich patterns of spin texture, from which important fingerprints exclusively associated with the spin helical feature are obtained. Furthermore, it is found that the nonmagnetic potential can create the resonance state in the spin density with different physics as the previously reported resonance of charge density.
PACS: 72.25.-b – Spin polarized transport / 73.20.-r – Electron states at surfaces and interfaces / 73.20.Hb – Impurity and defect levels; energy states of adsorbed species
© EPLA, 2016
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.