Searching for the Fractional Quantum Hall Effect in Graphite

被引：31

作者：

Kopelevich, Y. ^{[1
]}

Raquet, B. ^{[2
,3
]}

Goiran, M. ^{[2
,3
]}

Escoffier, W. ^{[2
,3
]}

da Silva, R. R. ^{[1
]}

Medina Pantoja, J. C. ^{[1
]}

Luk'yanchuk, I. A. ^{[4
]}

Sinchenko, A. ^{[5
,6
]}

Monceau, P. ^{[6
]}

机构：

[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, UNICAMP, BR-13083970 Campinas, SP, Brazil

[2] CNRS, LNCMI, UPR 3228, F-31400 Toulouse, France

[3] Univ Toulouse, LNCMI, INSA, UPS, F-31400 Toulouse, France

[4] Univ Picardie Jules Verne, Phys Mat Condensee Lab, F-80039 Amiens, France

[5] Moscow Engn Phys Inst, Moscow 115409, Russia

[6] CNRS, Inst Neel, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 11期

基金：

巴西圣保罗研究基金会;

关键词：

ELECTRONIC PHASE-TRANSITION; STRONG-MAGNETIC-FIELD; DENSITY-WAVE; MAGNETORESISTANCE; TRANSPORT;

D O I：

10.1103/PhysRevLett.103.116802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Measurements of basal plane longitudinal rho(b)(B) and Hall rho(H)(dB) resistivities were performed on highly oriented pyrolytic graphite samples in a 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 holelike. 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. In addition, well-defined plateaus in rho(H)(B) were detected in the ultraquantum limit revealing possible signatures of the fractional quantum Hall effect in graphite.

引用

页数：4

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