Extended Data Fig. 4: Forcing a cycle.
From: Spontaneous ordering of identical materials into a triboelectric series
We produce pristine samples A, B, C and X. We start by biasing sample A against X with 25 contacts, then we bias sample B against A with 25 contacts while measuring ΔQ5. Next, we bias sample C against B with 150 contacts while measuring ΔQ5. Finally, we measure ΔQ5 between C and A. The results in matrix form show the appearance of a cycle.
