TY - JOUR
T1 - Superconductivity, superfluidity and quantum geometry in twisted multilayer systems
AU - Törmä, Päivi
AU - Peotta, Sebastiano
AU - Bernevig, Bogdan A.
N1 - Funding Information:
S.P. and P.T. acknowledge support by the Academy of Finland under project numbers 330384, 336369, 303351 and 327293. B.A.B. acknowledges support from the Office of Naval Research grant no. N00014-20-1-2303 and from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 101020833).
Publisher Copyright:
© 2022, Springer Nature Limited.
PY - 2022/8
Y1 - 2022/8
N2 - Superconductivity has been observed in moiré systems such as twisted bilayer graphene, which host flat, dispersionless electronic bands. In parallel, theory work has discovered that superconductivity and superfluidity of flat-band systems can be made possible by the quantum geometry and topology of the band structure. These recent key developments are merging into a flourishing research topic: understanding the possible connection and ramifications of quantum geometry on the induced superconductivity and superfluidity in moiré multilayer and other flat-band systems. This article presents an introduction to how quantum geometry governs superconductivity and superfluidity in platforms including, and beyond, graphene. Ultracold gases are introduced as a complementary platform for quantum geometric effects and a comparison is made to moiré materials. An outlook sketches the prospects of twisted multilayer systems in providing the route to room-temperature superconductivity.
AB - Superconductivity has been observed in moiré systems such as twisted bilayer graphene, which host flat, dispersionless electronic bands. In parallel, theory work has discovered that superconductivity and superfluidity of flat-band systems can be made possible by the quantum geometry and topology of the band structure. These recent key developments are merging into a flourishing research topic: understanding the possible connection and ramifications of quantum geometry on the induced superconductivity and superfluidity in moiré multilayer and other flat-band systems. This article presents an introduction to how quantum geometry governs superconductivity and superfluidity in platforms including, and beyond, graphene. Ultracold gases are introduced as a complementary platform for quantum geometric effects and a comparison is made to moiré materials. An outlook sketches the prospects of twisted multilayer systems in providing the route to room-temperature superconductivity.
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U2 - 10.1038/s42254-022-00466-y
DO - 10.1038/s42254-022-00466-y
M3 - Review article
AN - SCOPUS:85131690484
SN - 2522-5820
VL - 4
SP - 528
EP - 542
JO - Nature Reviews Physics
JF - Nature Reviews Physics
IS - 8
ER -