Laughlin wavefunction
In condensed matter physics , the Laughlin wavefunction is an ansatz , proposed by Robert Laughlin for the ground state of a two-dimensional electron gas placed in a uniform background magnetic field in the presence of a uniform jellium background when the filling factor ( Quantum Hall effect ) of the lowest Landau level is formula_1 where formula_2 is an odd positive integer . 
<triplet> two-dimensional electron gas <subj> jellium <obj> instance of