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Condensed Matter > Materials Science

Title: Pressure-Tunable Photonic Band Gaps in an Entropic Colloidal Crystal

Abstract: Materials adopting the diamond structure possess useful properties in atomic and colloidal systems, and are a popular target for synthesis in colloids where a photonic band gap is possible. The desirable photonic properties of the diamond structure pose an interesting opportunity for reconfigurable matter: can we create a colloidal crystal able to switch reversibly to and from the diamond structure? Drawing inspiration from high-pressure transitions of diamond-forming atomic systems, we design a system of polyhedrally-shaped particles that transitions from diamond to a tetragonal diamond derivative upon a small pressure change. The transition can alternatively be triggered by changing the shape of the particle in-situ. We propose that the transition provides a reversible reconfiguration process for a potential new colloidal material, and draw parallels between this transition and phase behavior of the atomic transitions from which we take inspiration.
Comments: 6 REVTeX pages, 4 figures
Subjects: Materials Science (cond-mat.mtrl-sci); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Soft Condensed Matter (cond-mat.soft)
Cite as: arXiv:1803.06388 [cond-mat.mtrl-sci]
  (or arXiv:1803.06388v1 [cond-mat.mtrl-sci] for this version)

Submission history

From: Greg van Anders [view email]
[v1] Fri, 16 Mar 2018 20:14:45 GMT (687kb,D)