Abstract We investigate the crossed Andreev reflection (CAR) through a quantum dot (QD) coupled to topological superconducting single-stranded DNA (ssDNA). It is found that the topological nontrivial states appear in the QD due to leakage of the Majorana zero mode. Majorana zero mode can be identified by measuring the CAR. This device can be used as a Majorana zero mode detector that relies on the system parameters, such as the spin orbit coupling, the twist angle, molecular length. A high efficiency Cooper pair splitter can be realized by regulating the magnitude and direction of the gate voltage. In additions, the signature of CAR is robust against the Coulomb blockade and the disorder induced by distinct amino acids. This work provides an alternative method for detection of Majorana zero mode in ssDNA.

中文翻译：

---

与拓扑超导单链 DNA 耦合的量子点中的交叉 Andreev 反射

摘要 我们通过与拓扑超导单链 DNA (ssDNA) 耦合的量子点 (QD) 研究了交叉安德列夫反射 (CAR)。发现由于 Majorana 零模式的泄漏，QD 中出现了拓扑非平凡状态。Majorana 零模可以通过测量 CAR 来识别。该装置可用作马约拉纳零模探测器，它依赖于系统参数，如自旋轨道耦合、扭转角、分子长度。通过调节栅极电压的大小和方向，可以实现高效的 Cooper 对分路器。此外，CAR 的特征对库仑阻滞和由不同氨基酸引起的疾病具有很强的抵抗力。这项工作为检测 ssDNA 中的 Majorana 零模式提供了一种替代方法。