Fano‐Majorana Effect and Bound States in the Continuum on a Crossbar‐Shaped Quantum Dot Hybrid Structure

Transport properties are investigated through a crossbar‐shaped structure formed by a quantum dot (QD) coupled to two normal leads and embedded between two 1D topological superconductors (TSCs). Each TSC hosts Majorana‐bound states (MBSs) at its ends, which can interact between them with an effectiv...

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Bibliographic Details
Published in:Annalen der Physik 2019-06, Vol.531 (6), p.n/a
Main Authors: Ramos‐Andrade, Juan Pablo, Zambrano, David, Orellana, Pedro A.
Format: Article
Language:English
Subjects:
Amplitude modulation
bound state in the continuum
Coupling
Hybrid structures
Majorana bound state
quantum dot
Quantum dots
Topological superconductors
Transport properties
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Summary:Transport properties are investigated through a crossbar‐shaped structure formed by a quantum dot (QD) coupled to two normal leads and embedded between two 1D topological superconductors (TSCs). Each TSC hosts Majorana‐bound states (MBSs) at its ends, which can interact between them with an effective coupling strength. A signature of bound states in continuum (BIC) is found in the MBSs spectral function. By allowing finite inter MBSs coupling, BICs splitting is observed and shows projection in transmission for asymmetric coupling case as quasi‐BICs. As a consequence, it is also shown that the Fano effect, arising from interference phenomena between MBSs hybridization trough QD, is observed with a half‐integer amplitude modulation. It is believed that the findings can help to better understand the properties of MBSs and their interplay with QDs. The interplay between Majorana bound states and regular fermionic states is addressed in a quantum dot connected with topological superconductors. From interference phenomena, signatures of bound states in the continuum and modified Fano effect are observed in the system, both are described qualitatively by means of the development of analytical expressions.
ISSN:0003-3804
1521-3889
DOI:10.1002/andp.201800498