Superconductivity, superfluidity and quantum geometry in twisted multilayer systems

Päivi Törmä, Sebastiano Peotta, Bogdan A. Bernevig

Research output: Contribution to journalReview articlepeer-review

11 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)528-542
Number of pages15
JournalNature Reviews Physics
Volume4
Issue number8
DOIs
StatePublished - Aug 2022

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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