Scholarly Works, Center for Stochastic Processes in Science and Engineering (CSPISE)
Permanent URI for this collection
Browse
Browsing Scholarly Works, Center for Stochastic Processes in Science and Engineering (CSPISE) by Author "Janssen, H. K."
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- Strongly anisotropic roughness in surfaces driven by an oblique particle fluxSchmittmann, Beate; Pruessner, G.; Janssen, H. K. (American Physical Society, 2006-05)Using field theoretic renormalization, an MBE-type growth process with an obliquely incident influx of atoms is examined. The projection of the beam on the substrate plane selects a "parallel" direction, with rotational invariance restricted to the transverse directions. Depending on the behavior of an effective anisotropic surface tension, a line of second-order transitions is identified, as well as a line of potentially first-order transitions, joined by a multicritical point. Near the second-order transitions and the multicritical point, the surface roughness is strongly anisotropic. Four different roughness exponents are introduced and computed, describing the surface in different directions, in real or momentum space. The results presented challenge an earlier study of the multicritical point.
- Viability of competing field theories for the driven lattice gasSchmittmann, Beate; Janssen, H. K.; Täuber, Uwe C.; Zia, Royce K. P.; Leung, K. T.; Cardy, J. L. (American Physical Society, 2000-05)It has recently been suggested that the driven lattice gas should be described by an alternate held theory in the limit of infinite drive. We review the original and the alternate field theory, invoking several well-documented key features of the microscopics. Since the alternate field theory fails to reproduce these characteristics, we argue that it cannot serve as a viable description of the driven lattice gas. Recent results, for the critical exponents associated with this theory, are reanalyzed and shown to be incorrect.