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Carlos Payá @cPaya_phys
Joined May 2023
  • Tweets 149
  • Following 146
  • Followers 44
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It's on arXiv! 🚨 Absence of Quasi-Majorana False Positives in Full-Shell Hybrid Nanowires. TL;DR: The "trivial skin" saves the day. We show how CdGM analogs naturally push quasi-Majoranas out of reach in tunnel spectroscopy! 🧵👇 arxiv.org/abs/2604.24858 @icmm_csic @Q4Q_icmm

Absence of Quasi-Majorana False Positives in Full-Shell Hybrid Nanowires

Tunneling spectroscopy cannot be used as an unambiguous detection tool for Majorana zero modes (MZMs) in conventional partial-shell nanowires. The presence of smooth confinement at the end of the...

arxiv.org
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4/ The smoother (χ) the electrostatic potential, the larger this trivial skin is in space. If it's smooth enough to produce quasi-Majorana ZEPs, it pushes the topological region deep into the wire—making it completely inaccessible to tunnel spectroscopy!
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5/ Check out the full paper for the complete theoretical breakdown: arxiv.org/abs/2604.24858 With C. Robles, P. San-Jose and E. Prada. Learn more: Origins and behavior of Quasi-Majoranas: 🔗 scipost.org/10.21468/SciPost… CdGMs in full-shell nanowires: 🔗 journals.aps.org/prl/abstrac…

Absence of Quasi-Majorana False Positives in Full-Shell Hybrid Nanowires

Tunneling spectroscopy cannot be used as an unambiguous detection tool for Majorana zero modes (MZMs) in conventional partial-shell nanowires. The presence of smooth confinement at the end of the...

arxiv.org
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Fresh on PRB! Fluxoid valve effect in full-shell nanowire Josephson junctions link.aps.org/doi/10.1103/sdm… A new type of supercurrent valve based on tubular superconductors. @Q4Q_icmm @icmm_csic and @ifimacuam

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We find that the supercurrent can flow normally when the two fluxoid numbers are the same, but it is blocked otherwise. The on-off behavior can be controlled by tuning the magnetic field or the voltage of a backgate.
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The fluxoid valve represents a new type of quantum switch that could enable more sophisticated superconducting circuits. We also show that the valve effect is enhanced when the nanowires host Majorana zero modes, which are currently being investigated for quantum computing.
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Carlos Payá retweeted
Ramon Aguado @AguadoQuantum
11 Oct 2025
Si queréis saber más sobre el Premio Nobel de Física, aquí os lo cuento. Estos experimentos sentaron las bases de la tecnología cuántica basada en qubits superconductores #NobelPrize #quantum #superconductors #Physics #qubit
The Conversation ES @Conversation_E
10 Oct 2025
El Premio Nobel de Física de 2025 ha reconocido a John Clarke, Michel H. Devoret y John M. Martinis dar un paso más hacia la utilización de las propiedades de la física cuántica en aplicaciones comerciales y de utilidad pública. theconversation.com/nobel-de…
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New prerpint or arXiv!!: Non-Hermitian Skin Effect and Electronic Nonlocal Transport arxiv.org/abs/2510.00921 With O. Solow, E. Prada, @AguadoQuantum and K. Flensberg at @icmm_csic @UCPH_Research @Q4Q_icmm 1/9

Non-Hermitian skin effect and electronic nonlocal transport

Open quantum systems governed by non-Hermitian effective Hamiltonians exhibit unique phenomena, such as the non-Hermitian skin effect, where eigenstates localize at system boundaries. We...

arxiv.org
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On a personal level, grateful to O. Solow and K. Flensberg @UCPH_Research for an inspiring 3-month sprint at QDev-NBI last spring. Bringing together our knowledge on non-Hermitian theory and quantum transport was a game-changer. Hope to collaborate more in the future! 8/9
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Read the full paper on arxiv: arxiv.org/abs/2510.00921 9/9

Non-Hermitian skin effect and electronic nonlocal transport

Open quantum systems governed by non-Hermitian effective Hamiltonians exhibit unique phenomena, such as the non-Hermitian skin effect, where eigenstates localize at system boundaries. We...

arxiv.org
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