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arXiv 1201.6598cond-mat.mes-hallcond-mat.str-el
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具有可调相互作用的手征二维系统中k=3 Read-Rezayi态的稳定性

Stability of the k=3 Read-Rezayi state in chiral two-dimensional systems with tunable interactions

D. A. Abanin, Z. Papić, Y. Barlas, R. N. Bhatt

摘要:

k=3的Read-Rezayi(RR)仿费米子量子Hall态具有非阿贝尔激发,这为普适拓扑量子计算提供了一个平台.虽然在GaAs基二维电子系统中,当填充因子ν=12/5时,可以实现RR态,但相应的量子霍尔态很弱,目前几乎不可能在实验上研究。在这里,我们认为RR态可以在一类具有无质量和有质量的类Dirac能带结构的手性材料中实现。这类材料包括单层和双层石墨烯,以及拓扑绝缘体。我们表明,相比GaAs,这些系统提供了几个重要的优势,在实现和研究RR状态。最重要的是,可以通过改变外部磁场和通过设计样品的介电环境来调整{ \it in situ}有效相互作用。这种可调谐性使得在不同的朗道能级上实现具有可控能隙的RR态成为可能。它还允许人们探测到其他可压缩和不可压缩相的量子相变。

英文摘要:

The k=3 Read-Rezayi (RR) parafermion quantum Hall state hosts non-Abelian excitations which provide a platform for the universal topological quantum computation. Although the RR state may be realized at the filling factor ν=12/5 in GaAs-based two-dimensional electron systems, the corresponding quantum Hall state is weak and at present nearly impossible to study experimentally. Here we argue that the RR state can alternatively be realized in a class of chiral materials with massless and massive Dirac-like band structure. This family of materials encompasses monolayer and bilayer graphene, as well as topological insulators. We show that, compared to GaAs, these systems provide several important advantages in realizing and studying the RR state. Most importantly, the effective interactions can be tuned {\it in situ} by varying the external magnetic field, and by designing the dielectric environment of the sample. This tunability enables the realization of RR state with controllable energy gaps in different Landau levels. It also allows one to probe the quantum phase transitions to other compressible and incompressible phases.

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