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In NaAlSi, as it cools, electrons form fleeting ripples — stripes that appear and vanish, like patterns on water stirred by wind. These stripes intertwine with superconductivity, a state where current flows without resistance. Typically, for this, electrons pair up with uniform binding energy. But here, the energy to break a pair, or the gap, fluctuates in rhythm with the ripple: where stripes are denser, the bond is stronger. This was unexpected from the Standard Model.

Computer simulations revealed that the electron stripes reduce chaos in the system (scientists call this lowering entropy), and that's exactly what boosts superconductivity. Paradoxically, the ripple, which looks like disorder, brings extra order. The ripple itself lasts only trillionths of a second, yet it manages to alter the properties of the whole crystal. This discovery brings us closer to unraveling high-temperature superconductors — materials that promise lossless electronics.

Original abstract

as written by the authors arXiv:2601.10939

Electronic nematic and smectic liquid crystals are spontaneous symmetry-breaking phases that are seen to precede or coexist with enigmatic unconventional superconducting states in multiple classes of materials. In this Letter we describe scanning tunneling microscopy observations of a short ranged charge stripe (smectic) order in NaAlSi, whose superconductivity is speculated to have an unconventional origin. As well as this we resolve a clear spatial modulation of the superconducting gap amplitude, which arises due to the intertwined superconducting and smectic orders. Numerical calculations help to understand the possible driving mechanism as a suppression of kinetic energy on the Fermi surface formed in part by two large, flat-topped hole pockets of p-orbital character.