August 30, 2021 to September 3, 2021
University of Innsbruck
Europe/Zurich timezone

【146】Fragile topology and flat-band superconductivity

Sep 2, 2021, 4:00 PM
Room A

Room A

Talk Condensed Matter Physics (KOND) Condensed Matter Physics


Valerio Peri


Recent theoretical works unveiled that crystalline symmetries can stabilize topologically fragile Bloch bands that challenge our very notion of topology: one can trivialize these bands through the addition of trivial Bloch bands. Here, we show via auxiliary-field Monte Carlo simulations how fragile topology enhances the superfluid weight and hence the superconducting critical temperature. This feature is particularly relevant in flat-band systems where the conventional contribution to the superfluid weight vanishes and might explain the high transition temperature observed in magic-angle twisted bilayer graphene.

Primary author

Valerio Peri


Prof. Sebastian Huber (ETH Zurich ) Prof. Andrei Bernevig (Princeton University) Dr Zhida Song (Princeton University)

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