Non-Universal Fractional Quantum Hall States in a Quantum wire

Details Non-Universal Fractional Quantum Hall States in a Quantum wire Non-Universal Fractional Quantum Hall States in a Quantum wire

1995-05-17

arxiv.org/abs/cond-mat/9505071v1

Physics

Condensed Matter

10 pages, REVTEX

Scientific paper

10.1143/JPSJ.64.2302

The ground state as well as low-lying excitations in a 2D electron system in strong magnetic fields and a parabolic potential is investigated by the variational Monte Calro method. Trial wave functions analogous to the Laughlin state are used with the power-law exponent as the variational parameter. Finite size scaling of the excitation energy shows that the correlation function at long distance is characterized by anon-universal exponent in sharp contrast to the standard Laughlin state.The Laughlin-type state becomes unstable depending on strength of the confining potential.

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