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arXiv 1603.03041cond-mat.str-elcond-mat.supr-con
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具有$\mathbb{Z}_2$拓扑和Ising-Schmidt序的Fermi液体的限制跃迁的超导电性

Superconductivity from a confinement transition out of a fractionalized Fermi liquid with $\mathbb{Z}_2$ topological and Ising-nematic orders

Shubhayu Chatterjee, Yang Qi, Subir Sachdev, Julia Steinberg

摘要:

利用Schwinger-boson理论研究了阻挫正方晶格反铁磁体,得到了一个稳定的、带隙的$\mathbb{Z}_2$自旋液体基态,它具有时间反演对称性、无公度自旋关联和长程Ising-Err序.我们用费米子自旋子(费米子自旋子可以被认为是玻色子自旋子和介子的束缚态)得到了这个态的等价描述。在掺杂时,$\mathbb{Z}_2$自旋液体可以导致具有类电子准粒子的小费米袋的分馏费米液体(FL*),同时保持$\mathbb{Z}_2$拓扑和伊辛-伊辛阶。我们描述了一个希格斯过渡到一个限制超导状态,通常是富尔德-费雷尔-拉金-奥夫钦尼科夫型,与空间调制的超导秩序的这种解除限制的金属状态。

英文摘要:

The Schwinger-boson theory of the frustrated square lattice antiferromagnet yields a stable, gapped $\mathbb{Z}_2$ spin liquid ground state with time-reversal symmetry, incommensurate spin correlations and long-range Ising-nematic order. We obtain an equivalent description of this state using fermionic spinons (the fermionic spinons can be considered to be bound states of the bosonic spinons and the visons). Upon doping, the $\mathbb{Z}_2$ spin liquid can lead to a fractionalized Fermi liquid (FL*) with small Fermi pockets of electron-like quasiparticles, while preserving the $\mathbb{Z}_2$ topological and Ising-nematic orders. We describe a Higgs transition out of this deconfined metallic state into a confining superconducting state which is usually of the Fulde-Ferrell-Larkin-Ovchinnikov type, with spatial modulation of the superconducting order.

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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