Effects of electron interactions at crossings of Zeeman-split subbands in quantum wires
Effects of electron interactions at crossings of Zeeman-split subbands in quantum wires
复制标题
量子线中塞曼分裂子带交叉处电子相互作用的影响
DOI：
10.1103/physrevb.71.115303
复制
发表时间：
2005
影响因子：
3.7
通讯作者：
I. Yakimenko
中科院分区：
文献类型：
--
作者：
K. Berggren;P. Jaksch;I. Yakimenko
最近对面内磁场中弹道量子线中塞曼分裂一维子带的实验研究表明，在低电子密度下，随着子带交叉，会出现额外的非量子化电导结构[A. C. Graham等人，物理学修订版91，136404（2003）]。这些结构被称为0.7类似物。我们分析了Kohn-Sham自旋密度泛函方法中的实验数据，包括在平行的面内磁场B中无限分裂栅量子线的交换和关联效应。发现由于交换和库仑相互作用驱动的极化效应，能级在交叉时会突然重新排列。该模型很好地解释了实验定性特征。2005年美国物理学会。
Recent experimental studies of Zeeman-split one-dimensional subbands in ballistic quantum wires in an in-plane magnetic field show that additional nonquantized conductance structures occur as subbands cross at low electron densities [A. C. Graham et al., Phys. Rev.Lett. 91, 136404 (2003)]. These structures are called 0.7 analogs. We analyze the experimental transconductance data within the Kohn-Sham spin-density-functional method, including exchange and correlation effects for an infinite split-gate quantum wire in a parallel, in-plane magnetic field B∥. Energy levels are found to rearrange abruptly as they cross due to polarization effects driven by exchange and Coulomb interactions. Experimental qualitative features are explained well by this model. ©2005 The American Physical Society.