Quantum Interference Effects in Quantum Dot Molecular With Majorana Bound States

Frontiers in Physics

Zhen-Guo Fu¹  Ping Zhang¹  Xiao-Wen Zhang²  Zongliu Lu²  Lihui Wang²  Jing Wang³  Tian-Yu He³  Feng Chi³ 

[1] Beijing, China;Guilin, China;Zhongshan, China;

关键词: quantum dots;    Majorana bound states;    quantum interference;    Fano effect;    antiresonance;   

DOI  :  10.3389/fphy.2020.631031

来源: Frontiers

【 摘 要 】

Non-invasive detection of the Majorana bound state (MBSs), a kind of quasiparticle without charge and mass, is one of the core issues in current condensed matter physics. Here we study in theory the quantum interference effect in parallel-coupled double quantum dots which are connected either by Majorana bound states (MBSs) or regular fermions. We find that the zero-energy conductance develops a sharp peak when the dots are connected by the MBSs, whereas that in the case of the dots are coupled via regular fermions shows a valley. By varying the coupling strength between the dots and the electron reservoirs, the conductance in the two structures changes in different ways. By comparing the properties of the linear conductance in the two systems, the information of the MBSs formed at the two ends of a topological superconductor nanowire then can be inferred. We also find that the MBSs in the present structure also induces the Fano effect, and is favorable in quantum information processing.

【 授权许可】

CC BY