Metal-insulator transition in two- and three-dimensional logarithmic plasmas.
We consider the scaling of the mean square dipole moment in a plasma with logarithmic interactions in a two- and three-dimensional systems. In both cases, we establish the existence of a low-temperature regime where the mean square dipole moment does not scale with system size and a high-temperature regime where it does scale with system size. Thus, there is a nonanalytic change in the polarizability of the system as a function of temperature and hence a metal-insulator transition in both cases. The relevance of this transition in three dimensions to quantum phase transitions in (2+1)-dimensional systems is briefly discussed.
Kragset
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Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway. steinar.kragset@phys.ntnu.no
Sudbø
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Nogueira
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