publications list
Quantum melting on a lattice and a delocalization transition
A.L. Efros and E.V. Tsiper
Department of Physics, University of Utah, Salt Lake City, UT 84112
We consider 1D and 2D gas of spinless fermions with the Coulomb and
the short range interactions on a square lattice at T=0. Using exact
diagonalization technique we study finite clusters with up to 16 and
in some cases up to 20 particles at filling factors nu=1/2 and 1/6.
By increasing the hopping amplitude we obtain the low-energy spectrum
of the system in a wide range from the classical Wigner crystal to
almost free gas of fermions. The most efforts are made to study the
mechanism of the structural and insulator-metal transitions. We show
that both transitions are determined by the energy band of the defect
with the lowest energy in the Wigner crystal.
1997 Int. Conference on Strongly Coupled Coulomb Systems, Boston, August
3-10, 1997.
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