Spin-resolved edge states transport in a normal/ferromagnetic/normal topological insulator junction: The role of interface |
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| Institution: | 1. School of Computer Science, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004, China;2. School of Science, East China Jiaotong University, Nanchang 330013, China;1. Department of Physics, Razi University, Kermanshah, Iran;2. Department of Physics, University of Missouri, Columbia, Missouri 65201, USA;3. Department of Physics, University of Colorado, Colorado Springs, CO 80918, USA;1. College of Electronic and Electrical Engineering, Henan Normal University, Xinxiang, Henan 453600, China;2. College of Physics and Materials Science, Henan Normal University, Xinxiang, Henan 453600, China;3. Office of Educational Administration, Yantai Automobile Engineering Professional College, Yantai, Shandong 265500, China;1. School of Photovoltaic and Rene Energy Engineering, University of New South Wales, Sydney 2052, Australia;2. School of Physics, University of New South Wales, Sydney 2052, Australia |
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| Abstract: | The spin-resolved edge states transport in a normal/ferromagnetic/normal topological insulator (TI) junction is investigated numerically. It is shown that the transport properties of the hybrid junction strongly depend on the interface shape. For the junction with two sharp interfaces, a nonzero spin conductance can be generated besides the spin-split energy windows. Moreover, the axial symmetries of the in-plane spin conductance amplitude are broken. The underlying physics is attributed to the sharp-interface-induced quantum interference effect. However, for the hybrid junction with two smooth interfaces, a non-zero spin conductance can only be achieved in the spin-split energy windows. Further, the axial symmetries of the in-plane spin conductance amplitude recover. These findings may not only benefit to further apprehend the spin-dependent edge states transport in the hybrid TI junctions but also provide some theoretical bases to the application of the topological spintronics devices. |
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| Keywords: | Quantum wires Spin transport through interfaces |
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