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arXiv 0903.4093cond-mat.mes-hallcond-mat.str-el
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旋转玻色子在$ν=1$上的自旋链描述

Spin chain description of rotating bosons at $ν=1$

Emma Wikberg, Emil J. Bergholtz, Anders Karlhede

摘要:

我们考虑朗道能级玻色子填充薄环面上的$ν=1$。与以前的费米子在填充$ν=1/2$的工作类似,我们将低能扇区映射到自旋1/2链上。虽然费米子系统可以实现无隙XY相,我们表明,通常这不会发生玻色子系统。相反,δ函数和库仑相互作用导致在玻色子系统中的带隙相,特别是我们确定了一个相对应的非阿贝尔摩尔-里德状态。在自旋语言中,哈密顿量由铁磁次近邻相互作用主导,这导致了与物质的基态和激发态的非平凡简并性相一致的描述。此外,我们评论的相似性和差异,上述两个系统和费米子在$ν=5/2$。

英文摘要:

We consider bosons at Landau level filling $ν=1$ on a thin torus. In analogy with previous work on fermions at filling $ν=1/2$, we map the low-energy sector onto a spin-1/2 chain. While the fermionic system may realize the gapless XY-phase, we show that typically this does not happen for the bosonic system. Instead, both delta function and Coulomb interaction lead to gapped phases in the bosonic system, and in particular we identify a phase corresponding to the non-abelian Moore-Read state. In the spin language, the hamiltonian is dominated by a ferromagnetic next-nearest neighbor interaction, which leads to a description consistent with the non-trivial degeneracies of the ground and excited states of this phase of matter. In addition we comment on the similarities and differences of the two systems mentioned above and fermions at $ν=5/2$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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