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Unconventional superconductivity in magic-angle twisted trilayer graphene

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Title: Unconventional superconductivity in magic-angle twisted trilayer graphene
Authors: Fischer, A
Goodwin, ZAH
Mostofi, AA
Lischner, J
Kennes, DM
Klebl, L
Item Type: Journal Article
Abstract: Magic-angle twisted trilayer graphene (MATTG) recently emerged as a highly tunable platform for studying correlated phases of matter, such as correlated insulators and superconductivity. Superconductivity occurs in a range of doping levels that is bounded by van Hove singularities, which stimulates the debate of the origin and nature of superconductivity in this material. In this work, we discuss the role of spin-fluctuations arising from atomic-scale correlations in MATTG for the superconducting state. We show that in a phase diagram as a function of doping (ν) and temperature, nematic superconducting regions are surrounded by ferromagnetic states and that a superconducting dome with Tc ≈ 2 K appears between the integer fillings ν = −2 and ν = −3. Applying a perpendicular electric field enhances superconductivity on the electron-doped side which we relate to changes in the spin-fluctuation spectrum. We show that the nematic unconventional superconductivity leads to pronounced signatures in the local density of states detectable by scanning tunneling spectroscopy measurements.
Issue Date: 13-Jan-2022
Date of Acceptance: 1-Dec-2021
URI: http://hdl.handle.net/10044/1/94473
DOI: 10.1038/s41535-021-00410-w
ISSN: 2397-4648
Publisher: Nature Research
Start Page: 1
End Page: 10
Journal / Book Title: npj Quantum Materials
Volume: 7
Issue: 1
Copyright Statement: © The Author(s) 2022. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Sponsor/Funder: Engineering and Physical Sciences Research Council
Funder's Grant Number: EPSRC (EP/L015579/1)
Keywords: Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Quantum Science & Technology
Physics, Applied
Physics, Condensed Matter
Materials Science
Physics
CORRELATED STATES
TRANSITIONS
CASCADE
Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Quantum Science & Technology
Physics, Applied
Physics, Condensed Matter
Materials Science
Physics
CORRELATED STATES
TRANSITIONS
CASCADE
cond-mat.supr-con
cond-mat.supr-con
cond-mat.mes-hall
cond-mat.str-el
Publication Status: Published
Article Number: ARTN 5
Online Publication Date: 2022-01-13
Appears in Collections:Materials
Faculty of Natural Sciences



This item is licensed under a Creative Commons License Creative Commons