Phase coherence control of a programmable high-Tc superconductor created by light

• URL: http://arxiv.org/abs/2607.14567v1
• Date: Thu, 16 Jul 2026 04:48:30 GMT
• Title: Phase coherence control of a programmable high-Tc superconductor created by light
• Abstract summary: We report on a robust light-programmable superconducting (LiPS) state at an aluminium-silicon heterojunction.<n>The LiPS state shows features characteristic of a Berezinski-Kosterlitz-Thouless topological transition, but another distinct state appears at temperatures above 2 K.<n>The origin of the LiPS effect is attributed to light pulse control of the Moire-like superlattice of misfit dislocations.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The quest for superconductivity created by light extends for more than half a century, yet direct evidence of a true zero-resistance state -whose macroscopic quantum phase coherence is both created and controlled by light -- has remained elusive. Here we report for the first time on a complex but robust light-programmable superconducting (LiPS) state at an aluminium-silicon heterojunction that is created and fully controlled with femtosecond laser pulses. The superconducting critical temperatures -- ranging from 1.8-8.5 K, can be increased or erased at will by the application of tailored pulse sequences. At low temperatures the LiPS state shows features characteristic of a Berezinski-Kosterlitz-Thouless topological transition, but another distinct state appears at temperatures above 2 K, which shows clear signatures of quantum phase disorder. In the presence of a magnetic field we observe behaviour characteristic of vortex pinning and creep consistent with the 2-dimensional (2D) nature of the phase coherent system. The origin of the LiPS effect is attributed to light pulse control of the Moire-like superlattice of misfit dislocations (MDs) that naturally occur as a result of discommensurations between Al and Si lattices at the interface, and is clearly observable by high-resolution electron microscopy. We show how light pulses can be used to control the superlattice periodicity and highlight the appearance of topologically protected soliton-like kinks along the dislocation lines, important for imparting metastability to the system. The demonstration of LiPS opens a route to the design of metastable long-range phase coherent superconducting states, leading to light-engineering of quantum circuits, local gap tuning in quantum processors and novel devices utilizing switchable superconductivity.

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