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arXiv 0903.2369cond-mat.mes-hallcond-mat.str-el
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石墨中可能存在的分数量子霍尔效应

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, P. Monceau

摘要:

在垂直于石墨烯平面施加高达B = 50 T的脉冲磁场和1.5 K &lt; T 30 T的温度下,对高取向热解石墨(HOPG)样品进行了基面纵向rho_b(B)和Hall rho_H(B)的测量< 4.2 K. At B >,对于所有研究的样品,我们观察到rho_H(B)从类电子到类空穴的符号变化。对于我们最好的样品,当B &gt; 34T(T = 1.8K)时,rho_b(B)的增强可能与场驱动电荷密度波或Wigner晶化转变有关。此外,在超量子极限下,rho_H(B)出现了明显的平台,揭示了石墨中分数量子霍尔效应的特征。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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