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An epitaxial transition from a bicontinious double gyroid to a hexagonallypacked cylinder structure induced by an external flow is simulated usingreal-space dynamical self-consistent field technique. In order to simulate thestructural change correctly, we introduce a system size optimization techniqueby which emergence of artificial intermediate structures are suppressed. When ashear flow in [111] direction of the gyroid unit cell is imposed, a nucleationand growth of the cylinder domains is observed. We confirm that the generatedcylindrical domains grow epitaxially to the original gyroid domains as gyroid$d_{\{220\}}$ $\to$ cylinder $d_{\{10\}}$. In a steady state under the shearflow, the gyroid shows different reconnection processes depending on thedirection of the velocity gradient of the shear flow. A kinetic pathwaypreviously predicted using the self-consistent field theory where three foldjunctions transform into five fold junctions as an intermediate state is notobserved.Comment: 24 pages, 14 figures, submitted to Macromolecule

Epitaxial Transition from Gyroid to Cylinder in a Diblock Copolymer Melt