Story perspectives

UC Santa Barbara Captures Goldstone Mode in Twisted WSe2 Superlattice

5/19/2026

Summary

Story summary

UC Santa Barbara researchers captured Goldstone modes in a twisted WSe2 moiré superlattice.
They stacked atomically thin WSe2 sheets at 3.5°–5° twists to create the lattice.
Pump-probe ultrafast optics recorded a space-time movie that showed an intervalley coherent state and its Goldstone mode.
The Goldstone mode permits dissipationless valley-polarization transport without charge flow, pointing to ultralow-power electronics, spintronics and quantum-information technologies.

1 of 1

Story summary

UC Santa Barbara researchers captured Goldstone modes in a twisted WSe2 moiré superlattice.
They stacked atomically thin WSe2 sheets at 3.5°–5° twists to create the lattice.
Pump-probe ultrafast optics recorded a space-time movie that showed an intervalley coherent state and its Goldstone mode.
The Goldstone mode permits dissipationless valley-polarization transport without charge flow, pointing to ultralow-power electronics, spintronics and quantum-information technologies.