Parity independence of the zero-bias conductance peak in a nanowire based topological superconductor-quantum dot hybrid device.
Parity independence of the zero-bias conductance peak in a nanowire based topological superconductor-quantum dot hybrid device.
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基于纳米线的拓扑超导体-量子点混合器件中零偏置电导峰的奇偶独立性
DOI：
10.1038/srep07261
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发表时间：
2014-12-01
影响因子：
4.6
通讯作者：
Xu HQ
中科院分区：
文献类型：
--
作者：
Deng MT;Yu CL;Huang GY;Larsson M;Caroff P;Xu HQ
通过电荷输运测量，我们研究了基于纳米线的拓扑超导体-量子点-拓扑超导体混合器件中Majorana费米子的特征。在零磁场下，观察到了清晰的库仑金刚石和近藤效应。在有限的、足够强的磁场作用下，观察到了零偏压电导峰结构。研究发现，无论量子点中准粒子占据数的奇偶性如何，在多个连续的库仑菱形中都存在零偏压电导峰。此外，我们还发现零偏压电导峰在大多数情况下伴随着两个微分电导峰，形成三峰结构，偏压两侧峰之间的分离显示出与器件背景库仑电导振荡密切相关的振荡。观察到的零偏压电导峰和相关的三峰结构是符合马约拉纳费米子物理在这样的混合拓扑系统。
We explore the signatures of Majorana fermions in a nanowire based topological superconductor-quantum dot-topological superconductor hybrid device by charge transport measurements. At zero magnetic field, well-defined Coulomb diamonds and the Kondo effect are observed. Under the application of a finite, sufficiently strong magnetic field, a zero-bias conductance peak structure is observed. It is found that the zero-bias conductance peak is present in many consecutive Coulomb diamonds, irrespective of the even-odd parity of the quasi-particle occupation number in the quantum dot. In addition, we find that the zero-bias conductance peak is in most cases accompanied by two differential conductance peaks, forming a triple-peak structure and the separation between the two side peaks in bias voltage shows oscillations closely correlated to the background Coulomb conductance oscillations of the device. The observed zero-bias conductance peak and the associated triple-peak structure are in line with Majorana fermion physics in such a hybrid topological system.
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影响因子：
10.8
作者：
Nilsson, H. A.;Samuelsson, P.;Xu, H. Q.
通讯作者：
Xu, H. Q.
影响因子：
8.6
作者：
Oreg, Yuval;Refael, Gil;von Oppen, Felix
通讯作者：
von Oppen, Felix
影响因子：
10.8
作者：
Deng, M. T.;Yu, C. L.;Xu, H. Q.
通讯作者：
Xu, H. Q.
影响因子：
10.8
作者：
Nilsson, Henrik A.;Caroff, Philippe;Xu, H. Q.
通讯作者：
Xu, H. Q.
影响因子：
10.8
作者：
Abay, Simon;Nilsson, Henrik;Delsing, Per
通讯作者：
Delsing, Per