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arXiv 1106.3697cond-mat.mes-hall
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具有自旋轨道和库仑相互作用的量子环中的电荷和自旋密度分布

Electronic charge and spin density distribution in a quantum ring with spin-orbit and Coulomb interactions

Csaba Daday, Andrei Manolescu, D. C. Marinescu, Vidar Gudmundsson

摘要:

研究了具有Rashba和Dresselhaus自旋轨道耦合(SOI)的纳米环结构内的电荷和自旋密度分布。对于少量的相互作用电子,在外部磁场的存在下,系统的能谱计算通过一个精确的数值对角化程序。由此确定的本征态被用来估计环周围的电荷和自旋密度。我们发现,当考虑两个以上的电子时,SOI引起的电荷密度的变形显着平坦的库仑排斥,而自旋密度的放大。

英文摘要:

Charge and spin density distributions are studied within a nano-ring structure endowed with Rashba and Dresselhaus spin orbit coupling (SOI). For a small number of interacting electrons, in the presence of an external magnetic field, the energy spectrum of the system is calculated through an exact numerical diagonalization procedure. The eigenstates thus determined are used to estimate the charge and spin densities around the ring. We find that when more than two electrons are considered, the charge-density deformations induced by SOI are dramatically flattened by the Coulomb repulsion, while the spin density ones are amplified.

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