PARTITION-FUNCTION ZEROS FOR THE ONE-DIMENSIONAL ORDERED PLASMA IN DIRICHLET BOUNDARY-CONDITIONS

We consider the grand canonical partition function for the ordered one-dimensional, two-component plasma at fugacity-zeta in an applied electric field E with Dirichlet boundary conditions. The system has a phase transition from a low-coupling phase with equally spaced particles to a high-coupling phase with particles clustered into dipolar pairs. An exact expression for the partition function is developed. In zero applied field the zeros in the zeta-plane occupy the imaginary axis from -i infinity to -i-zeta(c) and i-zeta(c) to i infinity for some zeta(c). They also occupy the diamond shape of four straight Lines from +/- i-zeta(c) to zeta(c) and from +/- i-zeta(c). The fugacity-zeta acts like a temperature or coupling variable. The symmetry-breaking field is the applied electric field E. A finite-size scaling representation for the partition in scaled coupling and scaled electric field is developed. It has standard mean field form. When the scaled coupling is real, the zeros in the scaled field lie on the imaginary axis and pinch the real scaled field axis as the scaled coupling increases. The scaled partition function considered as a function of two complex variables, scaled coupling and scaled field, has zeros on a two-dimensional surface in a domain of four real variables. A numerical discussion of some of the properties of this surface is presented.