Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structural changes of diblock copolymer melts due to an external
  electric field: a self-consistent field theory study   We study the phase behavior of diblock copolymers in presence of an external
electric field. We employ self-consistent field theory and treat the relevant
Maxwell equation as an additional self-consistent equation. Because we do not
treat the electric field perturbatively, we can examine its effects even when
its magnitude is large. The electric field couples to the system's morphology
only through the difference between the dielectric constants of the two blocks.
We find that an external field aligns a body-centered cubic phase along the
(111) direction, reducing its symmetry group to $R{\bar 3}m$. Transitions
between this phase and the disordered or hexagonal phases can occur for
external electric fields ranging from a minimum to a maximum value beyond which
the $R{\bar 3m}$ phase disappears completely. This electric-field range depends
on diblock architecture and temperature. We present several cuts through the
phase diagram in the space of temperature, architecture and applied field,
including one applicable to a system recently studied.

23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th