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arXiv 1306.1528cond-mat.str-elcond-mat.supr-con
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纯库仑相互作用和时间反演对称破缺诱导的具有内禀拓扑序的超导性

Superconductivity with intrinsic topological order induced by pure Coulomb interaction and time-reversal symmetry breaking

Evelyn Tang, Xiao-Gang Wen

摘要:

最近,在某些具有公度填充的平带晶格系统中,发现了分数量子霍尔态,它具有任意子激发。我们研究这样的系统远离反作用,即在这样的系统中的任意子气体的基态。基础晶格的存在允许进入一个全新的状态,在这个状态下,任意子的动能可以大于它们的相互作用能。在磁通附着方法中,使用平均场,然后添加起伏,我们发现了几种可能的超流态。两个具有内禀拓扑序,即分别具有(Z_2)^4和(Z_8)^2熔合结构的分数准粒子,第三个没有分数激发,类似于BCS型态。这代表了一种纯粹由电子的强排斥和复杂跳跃驱动的超导机制。

英文摘要:

Recently, in certain flat band lattice systems at commensurate fillings, fractional quantum Hall states have been found -- which have anyonic excitations. We study such systems away from commensuration, i.e. the ground state of an anyon gas in such a system. The presence of the underlying lattice allows access to an entirely new regime where the anyon kinetic energy can be larger than their interaction energy. Within the flux-attachment approach, using mean-field then adding fluctuations, we find several possible superfluid states. Two have intrinsic topological order, i.e. fractionalized quasiparticles with a fusion structure of (Z_2)^4 and (Z_8)^2 respectively, and a third has no fractionalized excitations similar to a BCS-type state. This represents a mechanism for superconductivity driven purely by strong repulsion and complex hopping of electrons.

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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