Synopsis: Scaling the Heights

Researchers have found an exact solution to an equation describing growth of materials at interfaces.
Synopsis figure
Adapted from M. Kardar et al., Phys. Rev. Lett. 56, 889 (1986)

Even starting from a perfectly flat substrate, the growth of a thin film by continuous deposition can lead to a surface with increasing roughness. From a technological standpoint, interest in understanding this and other surface growth phenomena is clear, but growth behavior is also a challenging fundamental problem in nonequilibrium statistical physics. In the mid-1980s, three physicists devised the eponymous Kardar-Parisi-Zhang equation to describe how the distribution of heights on a growing surface evolves over time. Since then, the KPZ equation has been tackled for a variety of growth scenarios.

Writing in Physical Review Letters, Takashi Imamura of the University of Tokyo and Tomohiro Sasamoto at Chiba University, Japan, have built on prior work and discovered an exact solution of KPZ in the stationary case (that is, when the surface has evolved to a steady state.) The essential quantity they obtain is the two-point correlation function as a function of space and time, which is directly related to measurements of dynamic surface structure. The authors propose that laser-controlled growth of liquid crystal clusters could be used to experimentally test their stationary state calculations: a wide range of initial conditions can be produced with such a system, enabling a thorough analysis of different growth scenarios. – David Voss


Announcements

More Announcements »

Subject Areas

Materials ScienceStatistical Physics

Previous Synopsis

Next Synopsis

Related Articles

Viewpoint: Improving Electronic Structure Calculations
Materials Science

Viewpoint: Improving Electronic Structure Calculations

A new approach to calculating the properties of molecules and solids may offer higher accuracy at reasonable computational cost, accelerating the discovery of useful materials. Read More »

Synopsis: Jiggling Graphene
Graphene

Synopsis: Jiggling Graphene

The random quivering of graphene membranes could be exploited to generate electricity. Read More »

Synopsis: Get the Hydrogen Out
Industrial Physics

Synopsis: Get the Hydrogen Out

Using clean helium made with a two-step purification process could prevent damaging blockages in cryostats. Read More »

More Articles