IBM Research Division
Thomas J. Watson Research Center
Yorktown Heights, N.Y.

Now you see it, now you don't! New experiments show that the fractional quantum Hall correlated electron states collapse into normal, uncorrelated states when the "thickness" of the two-dimensional electron gas exceeds a certain critical value.

M. Shayegan, J. Jo, W. Suen, M. Santos, V.J. Goldman, "Collapse of the fractional quantum Hall effect in an electron system with large layer thickness," Physical Review Letters, 65, 2916-19, 3 December 1990. (Princeton University, N.J.; State University of New York, Stony Brook)

Both theory and experiments made significant progress in the last decade toward an understanding of freezing and melting. The problem has been successfully addressed in both directions (ordering and disordering). A recent review highlights the major developments.

D.W. Oxtoby, "New perspectives on freezing and melting," Nature, 347, 725-30, 25 October 1990. (University of Chicago)

Icosahedral quasicrystals were...

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