Discontinuities in the level density of small quantum dots under strong magnetic fields

Details Discontinuities in the level density of small quantum dots under strong magnetic fields Discontinuities in the level density of small quantum dots under strong magnetic fields

2002-07-22

arxiv.org/abs/cond-mat/0207537v1

Phys. Rev. B 66 (2002) 113311

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Accepted in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.66.113311

Exact diagonalization studies of the level density in a six-electron quantum dot under magnetic fields around 7 T (``filling factor'' around 1/2) are reported. In any spin-polarization channel, two regimes are visible in the dot excitation spectrum: one corresponding to interacting quasiparticles (i.e. composite fermions) for excitation energies below 0.4 meV, and a second one for energies above 0.4 meV, in which the level density (exponentially) increases at the same rate as in the non-interacting composite-fermion model.

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