Taking snapshots of spin–valley modes in a moiré superlattice

Nature Physics, Published online: 14 May 2026; doi:10.1038/s41567-026-03295-3 An ultrafast imaging technique captured the propagation of charge-decoupled excitations in twisted bilayer WSe2. Two spin–valley modes with distinct propagation behaviours were revealed, consistent with the phase and amplitude modes of a spin–valley superfluid.