Effects of interaction and polarization on spin-charge separation: A time-dependent spin-density-functional theory study

Effects of interaction and polarization on spin-charge separation: A time-dependent spin-density-functional theory study
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相互作用和极化对自旋电荷分离的影响:时间相关的自旋密度泛函理论研究

DOI:
10.1103/physrevb.81.104306
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发表时间:
2010-03
期刊:
Physical Review B (Condensed Matter and Materials Physics)
影响因子:
--
通讯作者:
Gao Xianlong
Gao Xianlong
中科院分区:
其他
文献类型:
--
作者:
Gao Xianlong

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利用含时自旋密度泛函理论计算了一维双组分费米子原子系统在强局域猝灭后的非平衡动力学演化。相互作用淬灭也被认为是看到其对自旋-电荷分离的影响。结果表明,在格点排斥作用下(Luttinger液体)的电荷速度大于自旋速度,在格点吸引作用下(Luther-Emery液体)的电荷速度大于自旋速度.我们发现,相互作用淬灭和极化抑制自旋-电荷分离。
We calculate the nonequilibrium dynamic evolution of a one-dimensional system of two-component fermionic atoms after a strong local quench by using a time-dependent spin-density-functional theory. The interaction quench is also considered to see its influence on the spin-charge separation. It is shown that the charge velocity is larger than the spin velocity for the system of on-site repulsive interaction (Luttinger liquid), and vise versa for the system of on-site attractive interaction (Luther-Emery liquid). We find that both the interaction quench and polarization suppress the spin-charge separation.
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