arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1908.00103cond-mat.str-el
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具有Z2拓扑序金属的可解晶格模型

Solvable lattice models for metals with Z2 topological order

Brin Verheijden, Yuhao Zhao, Matthias Punk

摘要:

我们提出了二维量子二聚体模型,实现了Z2拓扑有序的金属基态。我们的模型是[PNAS 112,9552 -9557(2015)]中引入的二聚体模型的推广,以提供空穴掺杂莫特绝缘体中非常规金属态的有效描述。在特定的参数范围内,我们构造了精确的基态波函数,并证明了基态实现了分数化的费米液体。由于Z2拓扑序的存在,Luttinger计数被修改,并且由费米面包围的体积与远离半填充的掺杂空穴的密度成比例。我们还评论了魔角扭曲双层石墨烯的可能应用。

英文摘要:

We present quantum dimer models in two dimensions which realize metallic ground states with Z2 topological order. Our models are generalizations of a dimer model introduced in [PNAS 112,9552-9557 (2015)] to provide an effective description of unconventional metallic states in hole-doped Mott insulators. We construct exact ground state wave functions in a specific parameter regime and show that the ground state realizes a fractionalized Fermi liquid. Due to the presence of Z2 topological order the Luttinger count is modified and the volume enclosed by the Fermi surface is proportional to the density of doped holes away from half filling. We also comment on possible applications to magic-angle twisted bilayer graphene.

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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