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Condensed Matter > Superconductivity

Title: Odd-frequency superconducting pairing and multiple Majorana edge modes in driven topological superconductors

Abstract: Majorana zero modes have been shown to be the simplest quasiparticles exhibiting pure odd-frequency pairing, an effect that has so far been theoretically established in the static regime. In this work we investigate the formation of Majorana modes and odd-frequency pairing in $p$-wave spin-polarized superconductors under a time-dependent drive. We first show that the driven system hosts multiple Majorana modes emerging at zero and $\pi$, whose formation can be controlled by an appropriate tuning of the drive frequency and chemical potential. Then we explore the induced pair correlations and find that odd-frequency spin-polarized $s$-wave pairing is broadly induced, acquiring large values in the presence of Majorana modes. We discover that, while odd-frequency pairing is proportional to $\sim1/\omega$ in the presence of Majorana zero modes, it is proportional to $\sim 1/(\omega-\pi\hbar/T)$ in the presence of Majorana $\pi$ modes, where $T$ is the periodicity of the drive. Furthermore, we find that the amount of odd-frequency pairing becomes larger when multiple Majorana modes appear but the overall divergent profile as a function of frequency remains. Our work thus paves the way for understanding the emergent pair correlations in driven topological superconductors
Comments: 12 pages, 6 figures
Subjects: Superconductivity (cond-mat.supr-con); Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Cite as: arXiv:2404.09517 [cond-mat.supr-con]
  (or arXiv:2404.09517v1 [cond-mat.supr-con] for this version)

Submission history

From: Eslam S. Ahmed [view email]
[v1] Mon, 15 Apr 2024 07:25:23 GMT (2139kb,D)

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