Molecular dynamics study of a classical two-dimensional electron system: Positional and orientational orders

Details Molecular dynamics study of a classical two-dimensional electron system: Positional and orientational orders Molecular dynamics study of a classical two-dimensional electron system: Positional and orientational orders

1999-06-15

arxiv.org/abs/cond-mat/9906213v2

Physica E 6 (2000) 116

Physics

Condensed Matter

6 pages, 4 figures; contributed to EP2DS-13; revised; to be published in Physica E

Scientific paper

10.1016/S1386-9477(99)00066-1

Molecular dynamics simulation is used to investigate the crystallization of a classical two-dimensional electron system, in which electrons interact with the Coulomb repulsion. From the positional and the orientational correlation functions, we have found an indication that the solid phase has a quasi-long-range (power-law correlated) positional order and a long-range orientational order. This implies that the long-range 1/r system shares the absence of the true long-range crystalline order at finite temperatures with short-range ones for which Mermin's theorem applies. We also discuss the existence of the ``hexatic'' phase predicted by the Kosterlitz-Thouless-Halperin-Nelson-Young theory.

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