La metrologia del tempo

Egidi, C.; Leschiutta, S.

doi:10.1007/bf02747247

Cited by 2 publications

(2 citation statements)

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“…Location of the h-levels follows form the poles of the diagonal matrix elements (3,3) and (4, 4) of g 0 and is particle-hole symmetric with respect to p-levels: Kh iσ = − Kp iσ , K = I, II and σ = ↓, ↑.…”

Section: Majorana Resonance In Presence Of In-gap Fano Resonancesmentioning

confidence: 99%

“…Majorana fermions, exotic quantum particles being their own antiparticles, were proposed by Majorana [1] as a real solution of Dirac equation. Recently their realization in solid state has been theoretically predicted, and then it was realized experimentally [2,3]. In solid state heterostructures they appear as quasiparticles, so called Majorana zero-modes (MZMs) [4].…”

Section: Introductionmentioning

confidence: 99%

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Sub-gap Fano resonances in a topological superconducting wire with on-site Coulomb interactions

Stefański

2021

J. Phys.: Condens. Matter

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We consider theoretically a 1D-semiconducting wire with strong Rashba interaction in proximity with s-wave superconductor, driven into topological phase by external magnetic field. Additionally, we take into account on-site Coulomb interactions inside the wire. The system is modelled by a tight binding Hamiltonian with Rashba hopping term and induced s-wave superconductivity. Calculations are performed utilizing recursive Green’s function method, and Coulomb interactions are treated selfconsistently within Hubbard I approximation. For the Hubbard levels residing within p-wave superconducting gap, particle–hole symmetric four-resonance structure develops in the density of states, apart from Majorana resonance. One pair of particle–hole symmetric resonances is created by the discrete II-Hubbard levels of the particular site, and the second pair of Hubbard sub-bands originates from recursive summation over the sites of the wire. Quantum interference between both types of pairs of states creates in-gap charge-conjugated Fano resonances with opposite asymmetry factors. We demonstrate that when quantum interference is dominated by two-particle tunneling, the Majorana resonance is strongly diminished, while it is not altered when single-particle tunneling dominates in interference process. We also discuss some consequences for experimental distinction of true Majorana states, and show that on-site Coulomb interactions support the appearance of topological phase.

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Section: Majorana Resonance In Presence Of In-gap Fano Resonancesmentioning

confidence: 99%