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Intrinsic topological superconductivity with exactly flat surface bands in the quasi-one-dimensional ACrAs (A=Na, K, Rb, Cs) superconductors
Cheng-Cheng Liu, Chen Lu, Li-Da Zhang +3
A spin-U(1)-symmetry protected momentum-dependent integer--valued topological invariant is proposed to time-reversal-invariant (TRI) superconductivity (SC) whose nonzero value w…
Doping-type-dependent pairing symmetry in predicted Ni-based high- superconductor LaNiSeO
Li-Da Zhang
We study the electronic instabilities of newly predicted Ni-based high- superconducting material LaNiSeO based on the random phase approximation. Our calculati…
Singlet -wave pairing in quasi-one-dimensional ACrAs (A=K, Rb, Cs) superconductors
Li-Da Zhang, Xiaoming Zhang, Juan-Juan Hao +2
The recent discovery of quasi-one-dimensional Chromium-based superconductivity has generated much excitement. We study in this work the superconducting instabilities of a represent…
Chiral SDW and d + id superconductivity in the magic-angle twisted bilayer-graphene
Cheng-Cheng Liu, Li-Da Zhang, Wei-Qiang Chen +1
We model the newly synthesized magic-angle twisted bilayer-graphene superconductor with two -like Wannier orbitals on the superstructure honeycomb lattice, where the hoppi…
Superconducting pairing in SrRuO from weak to intermediate coupling
Li-Da Zhang, Wen Huang, Fan Yang +1
The unconventional superconductivity in SrRuO continues to attract considerable interest. While many measurements can be interpreted on the basis of chiral -wave pairing…
Modified London Equation, Abrikosov-Like Vortices and Knot Solitons in Two-Gap Superconductors
Li-Da Zhang, Yi-Shi Duan, Yu-Xiao Liu
We derive the exact modified London equation for the two-gap superconductor, compare it with its single-gap counterpart. We show that the vortices in the two-gap superconductor are…