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Microwave signatures of Majorana states in a topological Josephson junction

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2015

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Väyrynen, Jukka I.
Glazman, Leonid I.

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http://arxiv.org/abs/1504.03680

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We find the admittance of a topological Josephson junction Y(ω,φ0,T) as a function of frequency ω, the static phase bias φ0 applied to the superconducting leads, and temperature T. The dissipative part of Y allows for spectroscopy of the sub-gap states in the junction. The resonant frequencies ωM,n(φ0) for transitions involving the Majorana (M) doublet exhibit characteristic kinks in the φ0-dependence at φ0=π. The kinks -- associated with decoupled Majorana states -- remain sharp and the corresponding spectroscopic lines are bright at any temperature, as long as the leads are superconducting. The developed theory may help extracting quantitative information about Majorana states from microwave spectroscopy.

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530 Physik

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ISO 690VÄYRYNEN, Jukka I., Gianluca RASTELLI, Wolfgang BELZIG, Leonid I. GLAZMAN, 2015. Microwave signatures of Majorana states in a topological Josephson junction
BibTex
@unpublished{Vayrynen2015Micro-31032,
  year={2015},
  title={Microwave signatures of Majorana states in a topological Josephson junction},
  author={Väyrynen, Jukka I. and Rastelli, Gianluca and Belzig, Wolfgang and Glazman, Leonid I.}
}
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    <dcterms:abstract xml:lang="eng">We find the admittance of a topological Josephson junction Y(ω,φ0,T) as a function of frequency ω, the static phase bias φ0 applied to the superconducting leads, and temperature T. The dissipative part of Y allows for spectroscopy of the sub-gap states in the junction. The resonant frequencies ωM,n(φ0) for transitions involving the Majorana (M) doublet exhibit characteristic kinks in the φ0-dependence at φ0=π. The kinks -- associated with decoupled Majorana states -- remain sharp and the corresponding spectroscopic lines are bright at any temperature, as long as the leads are superconducting. The developed theory may help extracting quantitative information about Majorana states from microwave spectroscopy.</dcterms:abstract>
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