A type of electricity that was 'proven' to be impossible just showed up in a new class of materials.
April 17, 2026
Original Paper
Charge waves and dynamical signatures of topological phases in Su-Schrieffer-Heeger chains
arXiv · 2604.13682
The Takeaway
In topological materials, it was a long-held rule that certain types of charge oscillations simply could not happen because of the material's internal symmetry. These authors just proved that they can and do occur, overturning decades of theory. It is like finding waves in a pool that was supposed to be perfectly still by law. This discovery gives us a brand-new way to see and control these exotic states of matter in real-time. It could lead to a new generation of topological electronics that are faster and more reliable than anything we have today.
From the abstract
We investigate the emergence of charge waves and their temporal dynamics in one-dimensional Su-Schrieffer-Heeger (SSH) topological chains. Contrary to the conventional view that charge oscillations are suppressed in gapped topological systems with preserved chiral symmetry, we show that such oscillations can indeed occur. The general condition for an arbitrary oscillation period is analysed, and we find that the charge waves propagating along the chain do not depend on its topology, except at th