What is Hidden Dual Superconducting States in NbSe2/TaS2?

Superconductors are materials that carry electric current with exactly zero resistance, but physicists still do not fully understand how electrons behave inside some of them, and that understanding matters for future electronics and quantum computers. In ultra-thin layers of two crystals, niobium diselenide (NbSe2) and tantalum disulfide (TaS2), measurements seemed to show a single superconducting energy gap, a fingerprint of how electrons pair up, yet simple theories could not match its detailed shape. This research result shows the data fit a two-band model: two superconducting states so strongly linked that they look like one. The same picture also accounts for how the materials respond to magnetic fields. The work comes from the Hebrew University of Jerusalem and appeared in Physical Review Letters in July 2026.

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