Superconductivity, correlated insulators, and Wess-Zumino-Witten terms in twisted bilayer graphene

Christos Maine; Sachdev Subir; Scheurer Mathias S.

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Superconductivity, correlated insulators, and Wess-Zumino-Witten terms in twisted bilayer graphene

机译：Superconductivity, correlated insulators, and Wess-Zumino-Witten terms in twisted bilayer graphene

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摘要

Recent experiments on twisted bilayer graphene have shown a high-temperature parent state with massless Dirac fermions and broken electronic flavor symmetry; superconductivity and correlated insulators emerge from this parent state at lower temperatures. We propose that the superconducting and correlated insulating orders are connected by Wess-Zumino-Witten terms, so that defects of one order contain quanta of another order and skyrmion fluctuations of the correlated insulator are a "mechanism" for superconductivity. We present a comprehensive listing of plausible low-temperature orders and the parent flavor symmetry-breaking orders. The previously characterized topological nature of the band structure of twisted bilayer graphene plays an important role in this analysis.

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《Proceedings of the National Academy of Sciences of the United States of America.》 |2020年第47期|29543-29554|共12页
作者
Christos Maine; Sachdev Subir; Scheurer Mathias S.;
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作者单位

Dept Phys,Harvard Univ;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
twisted bilayer graphene; Wess-Zumino-Witten terms; strongly correlated systems; superconductivity; MAGIC-ANGLE; TRANSITIONS; CASCADE;

Superconductivity, correlated insulators, and Wess-Zumino-Witten terms in twisted bilayer graphene

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