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Materials adopting the diamond structure possess useful properties in atomicand colloidal systems, and are a popular target for synthesis in colloids wherea photonic band gap is possible. The desirable photonic properties of thediamond structure pose an interesting opportunity for reconfigurable matter:can we create a colloidal crystal able to switch reversibly to and from thediamond structure? Drawing inspiration from high-pressure transitions ofdiamond-forming atomic systems, we design a system of polyhedrally-shapedparticles that transitions from diamond to a tetragonal diamond derivative upona small pressure change. The transition can alternatively be triggered bychanging the shape of the particle in-situ. We propose that the transitionprovides a reversible reconfiguration process for a potential new colloidalmaterial, and draw parallels between this transition and phase behavior of theatomic transitions from which we take inspiration.

Pressure-Tunable Photonic Band Gaps in an Entropic Colloidal Crystal