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ultrasound measurements in the quantum limit of graphite

In a presence of a magnetic field, the charge carriers of a Fermi sea group into Landau levels (LLs). At high enough magnetic field, the so called quantum limit is reached when the carriers are confined into the lowest Landau levels. In such limit electronic correlations are at work to generate new electronic states such as composite fermions and topological states in the fractional quantum Hall effect in two dimensional systems. In three dimensions this limit is still largely unexplored (...)

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