Majorana Device Constructed to Investigate Non-Markovian Quantum Transport Dynamics: quantum semiconducting
By Bhavna KavetiAug 3 2022Reviewed by Susha Cheriyedath, M.Sc. In an article recently published in New Journal of Physics, a Majorana device was constructed using an asymmetric superconducting chain with two leads to investigate the device’s non-Markovian quantum transport dynamics.
The accurate transitory transport current and the related differential conductance were solved. The obtained results revealed the importance of interference between the right and left Majorana zero modes to facilitate the phase transition of conductance. This caused insulation of topologically trivial states localized at edges with zero conductance. However, the topologically nontrivial nonlocally distributed states showed a quantized conductance of 2e2/h.
On the other hand, the topological device’s edges with leads result in Andreev reflection-based Majorana resonance, where the differential conductance at the zero-bias peak is quantized to 2e2/h. Nevertheless, when the previous attempts to identify and separate Majorana bound states from the Andreev bound states were made, the disorders and noises in these systems made the identification of Majorana zero modes a challenging process.
Two-Terminal Majorana Device for Quantum Transport Dynamics In the present study, a two-terminal Majorana device was constructed that consisted of a p-wave superconducting Kitaev chain coupled to two leads for studying its transient transport properties. Regulating the chemical potential of the asymmetric superconducting chain helped its ground state to transition from the Majorana bound state to the Andreev bound state , while retaining the ground state energy as zero.
With the use of a large energy gap between zero and non-zero energy band in a long superconducting chain length, the zero bias conductance change from 2e2/h to phase transition point zero was substantial. Moreover, the obtained results were independent of lead’s structure and the coupling between superconducting chain and leads. These observations indicated that such a Majorana device can be used as an external-field controlled diode.
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