Transport through a quantum dot coupled to two Majorana bound states

Abstract

We investigate electron transport inside a ring system composed of a quantum dot (QD) coupled to two Majorana bound states confined at the ends of a one-dimensional topological superconductor nanowire. By tuning the magnetic flux threading through the ring, the model system we consider can be switched into states with or without zero-energy modes when the nanowire is in its topological phase. We find that the Fano profile in the conductance spectrum due to the interference between bound and continuum states exhibits markedly different features for these two different situations, which consequently can be used to detect the Majorana zero-energy mode. Most interestingly, as a periodic function of magnetic flux, the conductance shows $2\pi$ periodicity when the two Majorana bound states are nonoverlapping (as in an infinitely long nanowire) but displays $4\pi$ periodicity when the overlapping becomes nonzero (as in a finite length nanowire). We map the model system into a QD--Kitaev ring in the Majorana fermion representation and affirm these different characteristics by checking the energy spectrum.

8 pages, 8 figures

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Cited by in corpus (12)

• Fano Resonances in Majorana Bound States - Quantum Dot Hybrid Systems
• Transport signatures of Majorana bound states in superconducting hybrid structures
• Quantum transport through a quantum dot side-coupled to a Majorana bound state pair in the presence of electron-phonon interaction
• Majorana molecules and their spectral fingerprints
• Detecting coupling of Majorana bound states with an Aharonov-Bohm interferometer
• Signatures of the Majorana spin in electrical transport through a Majorana nanowire
• Aharonov-Bohm interference as a probe of Majorana fermions
• Phonon-Assisted Tunneling through Quantum Dot Systems Connected to Majorana Bound States
• Influences of electron-phonon interaction on quantum transport through one quantum-dot system with side-coupled Majorana zero mode
• Phase-controlled quantum transport signatures in a quantum dot-Majorana hybrid ring system
• Majorana Bound States hallmark in a quantum topological interferometer ring
• Topological superconducting phase in a non-Hermitian Kitaev chain with staggered pairing imbalance