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Philip Phillips (University of Illinois, Urbana-Champaign)
PHYSTALK/0002001

  Title:  2e or not 2e?
  In a series of recent experiments, Kravchenko and colleagues observed
unexpectedly that a two-dimensional electron gas in zero magnetic fields
can become conducting at low temperatures: the two-dimensionality was
imposed by confining the electron gas to the interface between two
semiconductors. The observation of this conducting phase is surprising,
as the conventional theory precludes the existences of a metallic state
at zero temperature in two dimensions. Nevertheless, there are now
several experiments confirming the existence of the new conducting phase
in dilute two-dimensional electron gases in zero magnetic field. Here we
argue, on the basis of an analysis of these experiments and general
theoretical grounds, that this phase is in fact a superconductor with an
inhomogeneous charge density.
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Horacio G. Rotstein (Brandeis University)
MATHTALK/0002001
Title:  Interface dynamics for the Allen-Cahn equation with memory

 We consider an integrodifferential partial differential
 equation as a mathematical model for phase transition dynamics when
 memory effects are present. By taking appropriate kernels, this
 convolution equation can be reduced to both the Klein-Gordon
 equation and the bistable equation. By means of a formal asymptotic
 analysis we derive an equation governing the dynamics of a front, an
 interface separating between two phases ... TalkInfo: Department
 of  of Physics, Northeastern University, 29 February 2000

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