Majorana fermion modulated nonequilibrium transport through double quantum dots

• Published in: Physics letters. A Vol. 378; no. 30-31; pp. 2256 - 2262
• Main Authors: Deng, Ming-Xun, Wang, Rui-Qiang, Ai, Bao-Quan, Yang, Mou, Hu, Liang-Bin, Zhong, Qing-Hu, Wang, Guang-Hui
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 13.06.2014
• Subjects: Andreev reflection; Electronic transport; Electronics; Fermions; Majorana fermion; Quantum dot; Quantum dots; Reflection; Signatures; Solid state physics; Switching; Transport; Quantum dot; Andreev reflection; Majorana fermion; Electronic transport
• ISSN: 0375-9601; 1873-2429
• DOI: 10.1016/j.physleta.2014.05.018

Nonequilibrium electronic transports through a double-QD-Majorana coupling system are studied with a purpose to extract the information to identify Majorana bound states (MBSs). It is found that MBSs can help form various transport processes, including the nonlocal crossed Andreev reflection, local resonant Andreev reflection, and cotunneling, depending on the relative position of two dot levels. These processes enrich the signature of average currents and noise correlations to probe the nature of MBSs. We further demonstrate the switching between the current peaks of crossed Andreev reflection and cotunneling, which is closely related to the nonlocal nature of Majorana fermions. We also propose effective physical pictures to understand these Majorana-assisted transports. •Majorana fermions are characterized in the signature of currents and noises.•Three types of tunneling mechanisms are realized separately.•The switching of crossed Andreev reflection and cotunneling is realized.•Concrete physical pictures are proposed to understand Majorana-assisted transports.