AI Article Synopsis
- Strongly interacting electrons in solid-state systems can show multiple broken symmetries, leading to complex phase diagrams, particularly evident in magic-angle twisted bilayer graphene (TBG).
- Research reveals an anisotropic phase in TBG that appears above the underdoped region of the superconducting dome, where its intersection with the dome correlates with a drop in critical temperature.
- The superconducting state in TBG demonstrates direction-dependent responses to magnetic fields, suggesting that nematic ordering and fluctuations are significant in the behavior of its low-temperature phases.
Article Abstract
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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| http://dx.doi.org/10.1126/science.abc2836 | DOI Listing |
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