Abstract The Majorana-induced Andreev reflection is theoretically investigated, by considering an additional quantum dot coupled to the normal metallic lead. We find that the quantum dot takes variable effect on the zero-bias conductance induced by the Majorana zero mode. The non-superconducting dot with zero-energy level can suppress the Andreev reflection. Otherwise, the quantum dot only changes the width of the Andreev reflection peak around the zero-bias point with its magnitude equal to 2 e 2 h . Alternatively for the Majorana nonzero mode, the effect of quantum dot becomes dominant, including the zero-bias result. Our findings provide new insights for understanding the Andreev reflection driven by the Majorana modes in experiment.

中文翻译：

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间接耦合量子点对 Majorana 模式引起的 Andreev 反射的影响

摘要 通过考虑与普通金属铅耦合的附加量子点，从理论上研究了 Majorana 引起的 Andreev 反射。我们发现量子点对由马约拉纳零模式引起的零偏置电导产生可变影响。零能级的非超导点可以抑制安德列夫反射。否则，量子点仅改变零偏置点周围的安德列夫反射峰的宽度，其幅度等于 2 e 2 h 。或者，对于 Majorana 非零模式，量子点的影响变得占主导地位，包括零偏置结果。我们的发现为理解实验中由 Majorana 模式驱动的 Andreev 反射提供了新的见解。