Signatures of an intermediate 2d Coulomb phase at low temperatures

Details Signatures of an intermediate 2d Coulomb phase at low temperatures Signatures of an intermediate 2d Coulomb phase at low temperatures

1999-10-18

arxiv.org/abs/cond-mat/9910271v2

Europhys. Lett. 51, 89 (2000)

Physics

Condensed Matter

7 pages, 3 figures, to be published in Europhys. Lett

Scientific paper

10.1209/epl/i2000-00340-1

The study of the ground state of spinless fermions in 2d disordered clusters (Phys. Rev. Lett. {\bf 83}, 1826 (1999)) has suggested the existence of a new quantum phase for intermediate Coulomb energy to kinetic energy ratios $r_s$. Exact diagonalization of the same small clusters show that its low energy excitations (quantum ergodicity above a few ``hexatic'' excitations characterized by oriented currents) significantly differ from those occuring in the Fermi glass (weak $r_s$) and in the pinned Wigner crystal (large $r_s$). The ``hexatic'' excitations vanish for temperatures of order of the Fermi temperature.

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