Mawrie Alestin, Biswas Tutul, Ghosh Tarun Kanti
Department of Physics, Indian Institute of Technology-Kanpur, Kanpur-208 016, India.
J Phys Condens Matter. 2014 Oct 8;26(40):405301. doi: 10.1088/0953-8984/26/40/405301. Epub 2014 Sep 11.
The spin-orbit interaction in heavy hole gas formed at p-doped semiconductor heterojunctions and electron gas at SrTiO3 surfaces is cubic in momentum. Here we report magnetotransport properties of k-cubic Rashba spin-orbit coupled 2D fermionic systems. We study longitudinal and Hall components of the resistivity tensor analytically as well as numerically. The longitudinal resistivity shows a beating pattern due to different Shubnikov-de Haas (SdH) oscillation frequencies f ± for spin-up and spin-down fermions. We propose empirical forms of f ± as exact expressions are not available, which are being used to find locations of the beating nodes. The beating nodes and the number of oscillations between any two successive nodes obtained from exact numerical results are in excellent agreement with those calculated from the proposed empirical formula. In the Hall resistivity, an additional Hall plateau appears between the two conventional ones as the spin-orbit coupling constant increases. The width of this additional plateau increases with spin-orbit coupling constant.
在p型掺杂半导体异质结处形成的重空穴气体以及SrTiO₃表面的电子气中的自旋 - 轨道相互作用在动量上是立方的。在此，我们报告k立方 Rashba 自旋 - 轨道耦合二维费米子系统的磁输运性质。我们通过解析和数值方法研究了电阻率张量的纵向和霍尔分量。由于自旋向上和自旋向下的费米子具有不同的舒布尼科夫 - 德哈斯（SdH）振荡频率f±，纵向电阻率呈现出拍频模式。由于没有精确表达式，我们提出了f±的经验形式，用于确定拍频节点的位置。从精确数值结果获得的拍频节点以及任意两个连续节点之间的振荡次数与根据所提出的经验公式计算得到的结果非常吻合。在霍尔电阻率中，随着自旋 - 轨道耦合常数增加，在两个传统的霍尔平台之间出现了一个额外的霍尔平台。这个额外平台的宽度随着自旋 - 轨道耦合常数增加。
