Laboratoire National des Champs Magnétiques Intenses, Université de Toulouse, INSA, UPS, CNRS-UPR3228, 143 avenue de rangueil, 31400 Toulouse, France.
J Phys Condens Matter. 2010 Nov 3;22(43):436004. doi: 10.1088/0953-8984/22/43/436004. Epub 2010 Oct 11.
We report on the investigation of magnetic field induced charge density waves and Hall coefficient sign reversal in a quasi-two-dimensional electronic system of highly oriented pyrolytic graphite under very strong magnetic field. The change of Hall sign coefficient from negative to positive occurs at low temperature and high magnetic field just after the charge density wave transition, suggesting the role of hole-like quasi-particles in this effect. Angular dependent measurements show that the charge density wave transition and Hall sign reversal fields follow the magnetic field component along the c-axis of graphite.
我们报告了在强磁场下高度取向的热解石墨的准二维电子系统中，磁场诱导电荷密度波和霍尔系数符号反转的研究。在电荷密度波转变之后的低温和强磁场下，霍尔系数符号从负到正的变化表明了空穴类准粒子在这一效应中的作用。角相关测量表明，电荷密度波转变和霍尔系数反转场遵循石墨 c 轴方向的磁场分量。
