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Article

Negative Differential Conductance Induced by Majorana Bound States Side-Coupled to T-Shaped Double Quantum Dots

1
School of Electronic and Information Engineering, UEST of China, Zhongshan Institute, Zhongshan 528400, China
2
School of General Education, Quanzhou Ocean Vocational College, Quanzhou 362700, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2025, 15(17), 1359; https://doi.org/10.3390/nano15171359
Submission received: 21 June 2025 / Revised: 28 August 2025 / Accepted: 29 August 2025 / Published: 3 September 2025
(This article belongs to the Special Issue The Interaction of Electron Phenomena on the Mesoscopic Scale)

Abstract

Electronic transport through T-shaped double quantum dots (TDQDs) connected to normal metallic leads is studied theoretically by using a nonequilibrium Green’s function method. It is assumed that the Coulomb interaction exists only in the central QD (QD-1) sandwiched between the leads, and it is absent in the other reference QD (QD-2) side-coupled to QD-1. We also consider the impacts of Majorana bound states (MBSs), which are prepared at the opposite ends of a topological superconductor nanowire (hereafter called a Majorana nanowire) connected to QD-2, on the electrical current and differential conductance. Our results show that by the combined effects of the Coulomb interaction in QD-1 and the MBSs, a negative differential conductance (NDC) effect emerges near the zero-bias point, where MBSs play significant roles. Now, the electrical current decreases despite the increasing bias voltage. The NDC is prone to occur under conditions of low temperature, and both of the two QDs’ energy levels are resonant to the leads’ zero Fermi energy. Its magnitude, which is characterized by a peak-to-valley ratio, can be enhanced up to 3 by increasing the interdot coupling strength, and it depends on the dot-MBS hybridization strength nonlinearly. This prominent NDC combined with the previously found zero-bias anomaly (ZBA) of the differential conductance is useful in designing novel quantum electric devices, and it may also serve as an effective detection means for the existence of MBSs, which is still a challenge in solid-state physics.
Keywords: electronic transport; negative differential conductance; double quantum dots; Majorana bound states; zero-bias anomaly electronic transport; negative differential conductance; double quantum dots; Majorana bound states; zero-bias anomaly

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MDPI and ACS Style

Gao, Y.-M.; Huang, Y.-F.; Chi, F.; Yi, Z.-C.; Liu, L.-M. Negative Differential Conductance Induced by Majorana Bound States Side-Coupled to T-Shaped Double Quantum Dots. Nanomaterials 2025, 15, 1359. https://doi.org/10.3390/nano15171359

AMA Style

Gao Y-M, Huang Y-F, Chi F, Yi Z-C, Liu L-M. Negative Differential Conductance Induced by Majorana Bound States Side-Coupled to T-Shaped Double Quantum Dots. Nanomaterials. 2025; 15(17):1359. https://doi.org/10.3390/nano15171359

Chicago/Turabian Style

Gao, Yu-Mei, Yi-Fei Huang, Feng Chi, Zi-Chuan Yi, and Li-Ming Liu. 2025. "Negative Differential Conductance Induced by Majorana Bound States Side-Coupled to T-Shaped Double Quantum Dots" Nanomaterials 15, no. 17: 1359. https://doi.org/10.3390/nano15171359

APA Style

Gao, Y.-M., Huang, Y.-F., Chi, F., Yi, Z.-C., & Liu, L.-M. (2025). Negative Differential Conductance Induced by Majorana Bound States Side-Coupled to T-Shaped Double Quantum Dots. Nanomaterials, 15(17), 1359. https://doi.org/10.3390/nano15171359

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