Higher-order topological state induced by d-wave competing orders in high-Tc superconductor based heterostructures

Xiaoming Wang; Yu-Xuan Li; Tao Zhou

doi:10.1103/PhysRevB.106.205128

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Higher-order topological state induced by d-wave competing orders in high-Tc superconductor based heterostructures

Xiaoming Wang, Yu-Xuan Li, Tao Zhou

DOI 10.1103/PhysRevB.106.205128 · Physical Review B

T1

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Abstract

We introduce a two-dimensional Chern insulator in proximity to a d-wave pseudogap state of the high-Tc superconducting material as an effective platform to realize the higher-order topological system. The proximity-induced d-density-wave (DDW) order in the Chern insulator layer serves as an effective mass. The edge states will be fully gapped by this DDW order. In the real space, the sign of the DDW order parameter changes at the system corners due to the d-wave factor, leading to the gapless corner states, indicating that this system may be in a higher-order topological state. The higher-order topology in this coupled system is confirmed based on the calculation of the edge polarization and the quadrupole moment. In the superconducting state where the superconducting order and the DDW order coexist, the Majorana corner states emerge.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Hg1-xMnxTe/Cd1-xMnxTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
MnBi8Te13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown