We report the discovery of a new Twist Grain Boundary phase. This phase is characterised by a 2-dimensional undulation of the smectic C* like blocks in the form of a square lattice. We suggest that this three dimensionally modulated structure, which was not anticipated by theory, owes its origin to chiral interactions.
@article{arxiv.cond-mat/9712030,
title = {A 3 - dimensionally modulated structure in a chiral smectic-C liquid crystal},
author = {P. A. Pramod and R. Pratibha and N. V. Madhusudana},
journal= {arXiv preprint arXiv:cond-mat/9712030},
year = {2007}
}