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Zero-frequency supe...
Zero-frequency supercurrent susceptibility signatures of trivial and topological zero-energy states in nanowire junctions
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- Baldo, Lucas (author)
- Uppsala universitet,Kvantmateriens teori
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- Da Silva, Luis G. G. V. Dias (author)
- Univ Sao Paulo, Inst Fis, Rua Matao 1371, BR-05508090 Sao Paulo, SP, Brazil.
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- Black-Schaffer, Annica M. (author)
- Uppsala universitet,Materialteori
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- Cayao, Jorge (author)
- Uppsala universitet,Materialteori
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(creator_code:org_t)
- 2023-02-03
- 2023
- English.
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In: Superconductors Science and Technology. - : Institute of Physics (IOP). - 0953-2048 .- 1361-6668. ; 36:3
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Abstract
Subject headings
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- We propose a method to distinguish between trivial and topological, Majorana, zero-energy states (ZESs) in both short and long superconductor-normal-superconductor junctions based on Rashba nanowires using phase-biased equilibrium transport measurements. In particular, we show how the sawtooth profile of the supercurrent, due to the Majorana oscillation suppression in the topological phase for sufficiently long superconductor regions, leads to a strong signal in its zero-frequency susceptibility for a phase difference of ? = pi. This signal is notably insensitive to the chemical potential in the normal region, while trivial ZESs only causes signals in the susceptibility that is highly varying with the chemical potential, thus turning gating of the normal region into a simple experimental control knob. Furthermore, we obtain that, by tuning the junction transparency, critical currents in both short and long junctions undergo a reduction in the number of oscillations as a function of magnetic field only in the topological phase, an effect that find to be intimately linked to Majorana non-locality. Finally, we show that our results also hold at finite temperatures, thus highlighting their potential measurability under realistic experimental conditions.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- supercurrents
- topological superconductivity
- Majorana bound states
- trivial zero-energy states
- supercurrent susceptibility
- Josephson effect
Publication and Content Type
- ref (subject category)
- art (subject category)
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