Tunable transport through a quantum dot chain with side-coupled Majorana bound states
Tunable transport through a quantum dot chain with side-coupled Majorana bound states
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DOI：
10.1063/1.4895052
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发表时间：
2014-09
影响因子：
3.2
通讯作者：
C. Jiang;Gang Lu;W. Gong
中科院分区：
文献类型：
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作者：
C. Jiang;Gang Lu;W. Gong
我们研究了侧面耦合到一对Majorana束束态的量子点链的输运性质。结果表明，零偏置电导与Qd数的奇偶性密切相关。首先，如果引入Majorana零模耦合到奇数QD结构的一个量子点，则零偏置电导等于e22h，但是如果Majorana零模耦合到偶数QD结构的不同量子点，则零偏置电导将经历谷到峰的转变。另一方面，当MBS间耦合非零时，奇数量子点结构的零偏置电导谱出现一个峰值，偶数量子点结构的零偏置极限处出现一个电导谷。这些结果表明了在基于量子点-多量子点耦合的多量子点结构中操纵电流的可行性。此外，这样的系统可以是检测MBSS的候选系统。
We investigate the transport properties of a quantum dot (QD) chain side-coupled to a pair of Majorana bound states (MBSs). It is found that the zero-bias conductance is tightly dependent on the parity of QD number. First, if a Majorana zero mode is introduced to couple to one QD of the odd-numbered QD structure, the zero-bias conductance is equal to e22h, but the zero-bias conductance will experience a valley-to-peak transition if the Majorana zero mode couples to the different QDs of the even-numbered QD structure. On the other hand, when the inter-MBS coupling is nonzero, the zero-bias conductance spectrum shows a peak in the odd-numbered QD structure, and in the even-numbered QD structure one conductance valley appears at the zero-bias limit. These results show the feasibility to manipulate the current in a multi-QD structure based on the QD-MBS coupling. Also, such a system can be a candidate for detecting the MBSs.