Superconductivity-induced spectral weight transfer due to quantum geometry

Abstract

Optical spectral weight transfer associated with the onset of superconductivity at high energy scales compared with the superconducting gap has been observed in several systems such as high-$T_c$ cuprates. While there are still debates on the origin of this phenomenon, a consensus is that it is due to strong correlation effects beyond the BCS theory. Here we show that there is another route to a nonzero spectral weight transfer based on the quantum geometry of the conduction band in multiband systems. We discuss applying this idea to the cuprates and twisted multilayer graphene.

7 pages, 3 figures, accepted version

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Cited by in corpus (4)

• Quantum geometric effect on Fulde-Ferrell-Larkin-Ovchinnikov superconductivity
• Interplay of Band Geometry and Topology in Ideal Chern Insulators in Presence of External Electromagnetic Fields
• Many-body selection rule for quasiparticle pair creations in centrosymmetric superconductors
• Quantum-geometry-induced intrinsic optical anomaly in multiorbital superconductors