title: Fddd structure in AB-type diblock copolymers.
abstract: It is well known that lamellar structure, hexagonal structure of cylinder domains, gyroid and body-centred cubic structure of spherical domains all exist as equilibrium structures in AB-type diblock copolymers. We shall show in the present letter that, in addition to the above four phases, there is another equilibrium phase, the so-called Fddd structure which is an interconnected but uniaxial structure. We confirm this conclusion by two different methods. One is the mode-expansion including a substantial number of modes. The other is direct simulations of the time-evolution equation in three dimensions.
authors.affiliation: Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan.
authors.forename: Kohtaro
authors.initials: K
authors.lastname: Yamada
authors.forename: Makiko
authors.initials: M
authors.lastname: Nonomura
authors.forename: Takao
authors.initials: T
authors.lastname: Ohta