Nematicity and competing orders in superconducting magic-angle graphene

Cao, Yuan; Rodan-Legrain, Daniel; Park, Jeong Min; Yuan, Noah F. Q.; Watanabe, Kenji; Taniguchi, Takashi; Fernandes, Rafael M.; Fu, Liang; Jarillo-Herrero, Pablo

doi:10.1126/science.abc2836

Nematicity and competing orders in superconducting magic-angle graphene

Journal Article · Thu Apr 15 00:00:00 EDT 2021 · Science

DOI:https://doi.org/10.1126/science.abc2836· OSTI ID:1777669

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Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Research Center for Functional Materials, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA.

Strongly interacting electrons in solid-state systems often display multiple broken symmetries in the ground state. The interplay between different order parameters can give rise to a rich phase diagram. We report on the identification of intertwined phases with broken rotational symmetry in magic-angle twisted bilayer graphene (TBG). Using transverse resistance measurements, we find a strongly anisotropic phase located in a “wedge” above the underdoped region of the superconducting dome. Upon its crossing with the superconducting dome, a reduction of the critical temperature is observed. Furthermore, the superconducting state exhibits an anisotropic response to a direction-dependent in-plane magnetic field, revealing nematic ordering across the entire superconducting dome. These results indicate that nematic fluctuations might play an important role in the low-temperature phases of magic-angle TBG.

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Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: Fundación Bancaria ‘la Caixa’; Gordon and Betty Moore Foundation; Japan Ministry of Education, Culture, Sports, Science and Technology (MEXT); Japan Society for the Promotion of Science (JSPS); National Science Foundation (NSF); US Army Research Office (ARO); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0001819; SC0018945; SC0019300; SC0020045

OSTI ID:: 1777669

Alternate ID(s):: OSTI ID: 1835815

Journal Information:: Science, Journal Name: Science Journal Issue: 6539 Vol. 372; ISSN 0036-8075

Publisher:: American Association for the Advancement of Science (AAAS)Copyright Statement

Country of Publication:: United States

Language:: English

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