| Double Andreev reflections at surface states of the topological insulators with hexagonal warping |
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| 作者姓名： | Chang-Yong Zhu Shi-Han Zheng Hou-Jian Duan Ming-Xun Deng Rui-Qiang Wang |
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| 作者单位： | Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials;School of Physics and Mechanical and Electrical Engineering |
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| 基金项目： | was supported by GDUPS(2017);the National Natural Science Foundation of China(Grant Nos.11874016,11474106,and 11904107);the Key Program for Guangdong NSF of China(Grant No.2017B030311003). |
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| 摘 要： | We study the Andreev reflection(AR)at the interface of the topological insulator with hexagonal warping and superconductor junction.Due to the hexagonal warping effect,the double ARs are found in a certain range of the incident angle,where for one incident electron beam,two beams of holes are reflected back.Interestingly,both the beams of holes are reflected as retro-AR on the same side of the normal line of the interface but with different reflection angles,different from the previously reported double AR with one retro-AR and one specular-AR.The double reflections owing to the warping effect show the optics-like property of the Dirac fermion and can stimulate the double reflections of light in anisotropic crystals.In addition,we find that the double ARs are dependent on the hexagonal warping parameter nonmonotonically,and in an intermediate strength the double AR phenomenon is prominent,providing a possibility to explore the warping parameter of topological insulators.
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| 关 键 词： | ANDREEV REFLECTION TOPOLOGICAL INSULATOR WARPING effect |
Double Andreev reflections at surface states of the topological insulators with hexagonal warping |
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| Chang-Yong Zhu,Shi-Han Zheng,Hou-Jian Duan,Ming-Xun Deng,Rui-Qiang Wang.Double Andreev reflections at surface states of the topological insulators with hexagonal warping[J].Frontiers of Physics,2020,15(2):23602-86. |
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| Authors: | Chang-Yong Zhu Shi-Han Zheng Hou-Jian Duan Ming-Xun Deng Rui-Qiang Wang |
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| Institution: | 1. 1Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China2. 2School of Physics and Mechanical and Electrical Engineering, Shaoguan University, Shaoguan 512005, China |
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| Abstract: | We study the Andreev reflection (AR) at the interface of the topological insulator with hexagonal warping and superconductor junction. Due to the hexagonal warping effect, the double ARs are found in a certain range of the incident angle, where for one incident electron beam, two beams of holes are reflected back. Interestingly, both the beams of holes are reflected as retro-AR on the same side of the normal line of the interface but with different reflection angles, different from the previously reported double AR with one retro-AR and one specular-AR. The double reflections owing to the warping effect show the optics-like property of the Dirac fermion and can stimulate the double reflections of light in anisotropic crystals. In addition, we find that the double ARs are dependent on the hexagonal warping parameter nonmonotonically, and in an intermediate strength the double AR phenomenon is prominent, providing a possibility to explore the warping parameter of topological insulators. |
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| Keywords: | Andreev reflection topological insulator warping effect |
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