4 papers
Evolutionary freezing in a competitive population
N. F. Johnson, D. J. T. Leonard, P. M. Hui +1
We show that evolution in a population of adaptive agents, repeatedly competing for a limited resource, can come to an abrupt halt. This transition from evolutionary to non-evoluti…
Dynamical properties of a two-dimensional electron gas in a magnetic field within the composite fermion model
Darren J. T. Leonard, Neil F. Johnson
We investigate the response of a two-dimensional electron gas, in the fractional quantum Hall regime, to the sudden appearance of a localised charged probe using the Chern-Simons t…
Orthogonality catastrophe in a composite fermion liquid
Darren J. T. Leonard, T. Portengen, V. Nikos Nicopoulos +1
We discuss the emergence of an orthogonality catastrophe in the response of a composite fermion liquid as the filling factor νapproaches 1/2m, where m=1,2,3.... A tunneling experim…
Optical properties of a two-dimensional electron gas at even-denominator filling fractions
Darren J. T. Leonard, Neil F. Johnson, V. Nikos Nicopoulos +1
The optical properties of an electron gas in a magnetic field at filling fractions ν= {1\over 2m} (m=1,2,3...) are investigated using the composite fermion picture. The response of…