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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Persistent currents and spin-charge separation in a one-dimensional Hubbard ring with side sites
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Persistent currents and spin-charge separation in a one-dimensional Hubbard ring with side sites

机译：带有侧位的一维哈伯环中的持续电流和自旋电荷分离

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The persistent current and spin-charge separation are studied in a one-dimensional (1D) Hubbard ring with side sites connected to the even sites of the ring. At half filling, the persistent current is always paramagnetic and has a period of flux quantum. Away from half filling, as the onsite repulsion U increases, the sign of the current may oscillate depending on the total number of electrons N_e and the hopping t between the ring site and the side site. For small hopping t, the number of electrons N′_e in the ring sites plays an important role in determining the sign of the current. In contrast to the 1D Hubbard model, a weak or a moderate U can strongly enhance the persistent current while the hopping t always suppresses the current. The study on the transmit-tance of the ring with two connected leads indicates that in the large U and small t case, the transmittance varies with a period 1 /N′_e of a flux quantum, demonstrating a spin-charge separation in this system.
机译：在一维（1D）Hubbard环中研究了持久性电流和自旋电荷的分离，其侧位连接到环的偶数位。在填充一半时，持续电流始终是顺磁性的，并且具有一定的通量量子周期。除了半填充之外，随着现场斥力U的增加，电流的符号可能会振荡，具体取决于电子总数N_e和环状位点与侧位点之间的跃变t。对于小跳变t，环位中的电子数量N'_e在确定电流的符号中起重要作用。与1D Hubbard模型相反，弱或中等的U可以强烈增强持续电流，而跳变t总是抑制电流。对两根连接的环的透射率的研究表明，在大U和小t的情况下，透射率随通量量子的周期1 / N'_e变化，证明了该系统中的自旋电荷分离。

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