Bistable anchoring of nematics on rough substrates

David Cheung

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


We analyze the interplay between wetting and anchoring of nematic liquid crystals on disordering, e.g.,rough substrates in the framework of the Landau-de Gennes theory, in situations of competing homeotropic and planar easy axes on the substrate and the nematic-isotropic (NI) interface. The phase diagram for azimuthally symmetric substrates is calculated. We identify two regimes—a strongly coupled regime, where the wetting transition coincides with an anchoring transition, and a weakly coupled regime, where the two are separated. The anchoring transition is first order and switches between homeotropic and planar anchoring. The two competing orientations are metastable over a broad parameter range. Hence such surfaces can be used to generate bistable surfaces.
Original languageEnglish
Pages (from-to)243-249
JournalEPL: A Letters Journal Exploring the Frontiers of Physics
Issue number2
Publication statusPublished - 2006


  • nematics
  • rough substrates
  • Bistable anchoring


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