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  • Letter

Superconductivity-induced spectral weight transfer due to quantum geometry

Junyeong Ahn1,* and Naoto Nagaosa2,3,†

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
  • 2RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
  • 3Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan

  • *junyeongahn@fas.harvard.edu
  • †nagaosa@riken.jp
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Phys. Rev. B 104, L100501 – Published 7 September, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L100501

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-Tc 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.

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Phys. Rev. B 104, L100501– Published 7 September, 2021
  • Received 27 June 2021
  • Revised 18 August 2021
  • Accepted 23 August 2021
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