"Microscopic View of a Two-Dimensional Lattice-Gas Ising System within the Grand Canonical Ensemble"  V. P. LaBella, D. W. Bullock, M. Anser, Z. Ding, C. Emery, L. Bellaiche, and P. M. Thibado Physical Review Letters 84(18) 4152 (2000).

Description:

We discovered that the GaAs(001) surface behaves as a 2D lattice-gas Ising system. The STM images the occupied and unoccupied domains of the lattice gas on a scale comparable to the constituents of the gas, give never-before-seen insight into the Ising model. Correlation functions, directional nearest neighbor coupling energies, and four critical exponents are measured.

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