Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-04-21
Phys. Rev. B 72, 125315 (2005)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 10 figures. Submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.72.125315
Exact diagonalization of a two-dimensional electron gas in a strong magnetic field in the disk geometry shows that there exists a filling factor range in the second Landau level where the states significantly differ from those in the lowest Landau level. We show that the difference arises because the interaction between composite fermions is not negligible in higher Landau levels, as indicated by a substantial mixing between composite-fermion Landau-like levels, or lambda levels. We find that the exact ground state is well reproduced by composite fermion theory with lambda level mixing incorporated at the lowest level of approximation. Using the same variational approach in the spherical geometry we estimate the excitation gap at filling 1/3 in the second Landau level (which corresponds to 7/3 of experiment).
Jain Jainendra K.
Jeon Gun Sang
Peterson Michael R.
Toke Csaba
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