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Abstract: Quantum antidot, a small potential hill introduced into a two-dimensionalelectron system, presents an attractive tool to study quantum mechanics ofinteracting electrons.Here, we report experiments on electron resonanttunneling via a quantum antidot on the integer i = 1, 2, 3, 4, 5, and 6 quantumHall plateaus. Several new features are reported. First, as a function ofmagnetic field, we observe up to six quasiperiodic resonant tunneling peakswithin the fundamental flux period: when flux h-e is added to the area of theantidot there are i peaks on the i-th integer plateau, when i spin-polarizedLandau levels are occupied. Corresponding back gate voltage data show one peakper added charge e on all integer plateaus. Second, we observe tunneling dipsin four-terminal resistance -forward scattering- on the even i = 2, 4, and 6plateaus, when population of both spins is nearly equal. Also, for the firsttime, we report an internal structure within the h-e period: on the i = 3spin-split plateau, two of the three resonant tunneling peaks are higher and-orcloser than the third. Puzzlingly, in this regime, when back gate voltage isswept, the tunneling peaks are grouped in pairs. These results are attributedto the dominance of the electron-electron Coulomb interaction, effectivelymixing Landau level occupation, and to the self-consistent electrostatics ofthe antidot.



Autor: V. J. Goldman, Jun Liu, A. Zaslavsky

Fuente: https://arxiv.org/







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