Possible Fractional Quantum Hall Effect in Graphite

A. Sinchenko; B. Raquet; I. A. Lukyanchuk; J. C. Medina Pantoja; M. Goiran; P. Monceau; R. R. da Silva; W. Escoffier; Y. Kopelevich

arxiv: 0903.2369 · v1 · pith:5UHLT5PHnew · submitted 2009-03-13 · ❄️ cond-mat.mes-hall · cond-mat.str-el

Possible Fractional Quantum Hall Effect in Graphite

Y. Kopelevich , B. Raquet , M. Goiran , W. Escoffier , R. R. da Silva , J. C. Medina Pantoja , I. A. Lukyanchuk , A. Sinchenko

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P. Monceau

This is my paper

classification ❄️ cond-mat.mes-hall cond-mat.str-el

keywords graphitehalleffectfractionalmeasurementsquantumsampleswere

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Measurements of basal plane longitudinal rho_b(B) and Hall rho_H(B) resistivities were performed on highly oriented pyrolytic graphite (HOPG) samples in pulsed magnetic field up to B = 50 T applied perpendicular to graphene planes, and temperatures 1.5 K < T < 4.2 K. At B > 30 T and for all studied samples, we observed a sign change in rho_H(B) from electron- to hole-like. For our best quality sample, the measurements revealed the enhancement in rho_b(B) for B > 34 T (T = 1.8 K), presumably associated with the field-driven charge density wave or Wigner crystallization transition. Besides, well defined plateaus in rho_H(B) were detected in the ultra-quantum limit revealing the signatures of fractional quantum Hall effect in graphite.

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Possible Fractional Quantum Hall Effect in Graphite

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