Nodeless High- Superconductivity in the Highly Overdoped Monolayer
- Boston College, Chestnut Hill, MA (United States); Chinese Academy of Sciences (CAS), Beijing (China)
- Chinese Academy of Sciences (CAS), Beijing (China); Julius-Maximilians-Univ. Würzburg (Germany)
- Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
- Boston College, Chestnut Hill, MA (United States)
We study the electronic structure and superconductivity in a CuO2 monolayer grown recently on the d-wave cuprate superconductor Bi2Sr2CaCu2O8+δ. Density functional theory calculations indicate a significant charge transfer across the interface such that the CuO2 monolayer is heavily overdoped into the hole-rich regime yet inaccessible in bulk cuprates. We show that both the Cu dx2–y2 and d3z2–r2 orbitals become important and the Fermi surface contains one electron and one hole pocket associated with the two orbitals, respectively. Constructing a minimal correlated two-orbital model for the eg complex, we show that the spin-orbital exchange interactions produce a nodeless superconductor with extended s-wave pairing symmetry and a pairing energy gap comparable to the bulk d-wave gap, in agreement with recent experiments. Here, the findings point to a direction of realizing new high-Tc superconductors in ozone grown transition-metal-oxide monolayer heterostructures.
- Research Organization:
- Boston College, Chestnut Hill, MA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- Grant/Contract Number:
- FG02-99ER45747; PHY-1066293
- OSTI ID:
- 1610432
- Alternate ID(s):
- OSTI ID: 1483921
- Journal Information:
- Physical Review Letters, Vol. 121, Issue 22; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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