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Title: Superconductivity-induced spectral weight transfer due to quantum geometry

Journal Article · · Physical Review B
ORCiD logo [1];  [2]
  1. Harvard Univ., Cambridge, MA (United States)
  2. Inst. of Physical and Chemical Research (RIKEN), Wako (Japan); Univ. of Tokyo (Japan)

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. Further, we discuss applying this idea to the cuprates and twisted multilayer graphene.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
U.S. Department of Energy; USDOE Office of Science (SC), Basic Energy Sciences (BES); National Research Foundation of Korea (NRF); Japan Society for the Promotion of Science (JSPS)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1827107
Report Number(s):
IS-J--10,596; 2020R1A6A3A03037129; DE-AC02-07CH11358; JPMJCR1874; JPMJCR16F1; 18H03676
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 10 Vol. 104; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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