Nematicity Arising from a Chiral Superconducting Ground State in Magic-Angle Twisted Bilayer Graphene under In-Plane Magnetic Fields

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Date
2021-09-13
Author
Yu, Tao
Kennes, Dante M.
Rubio Secades, Angel
Sentef, Michael A.
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Physical Review Letters 127(12) : (2021) // Article ID 127001
URI
http://hdl.handle.net/10810/53692
Abstract
Recent measurements of the resistivity in magic-angle twisted bilayer graphene near the superconducting transition temperature show twofold anisotropy, or nematicity, when changing the direction of an in-plane magnetic field [Cao et al., Science 372, 264 (2021)]. This was interpreted as strong evidence for exotic nematic superconductivity instead of the widely proposed chiral superconductivity. Counter-intuitively, we demonstrate that in two-dimensional chiral superconductors the in-plane magnetic field can hybridize the two chiral superconducting order parameters to induce a phase that shows nematicity in the transport response. Its paraconductivity is modulated as cos(2 theta(B)), with theta(B) being the direction of the in-plane magnetic field, consistent with experiment in twisted bilayer graphene. We therefore suggest that the nematic response reported by Cao et al. does not rule out a chiral superconducting ground state.
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Attribution 4.0 International (CC BY 4.0)
Except where otherwise noted, this item's license is described as Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Attribution 4.0 International (CC BY 4.0)