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| VOLUME 118 (2023) | ISSUE 11 | PAGE 834 |
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Nodal line topological superconducting state in quasi-one-dimensional A2Cr3As3 (A = K, Rb, Cs) superconductors
M. Wang+, W. LiMing+, T. Zhou+* 1)
+Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics, South China Normal University, 510006 Guangzhou, China *Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Frontier Research Institute for Physics, South China Normal University, 510006 Guangzhou, China
Abstract
In this theoretical study, we examine the topological properties of the recently discovered A2Cr3As3 (A = K, Rb, Cs) superconductors. In the superconducting state, characterized by a typical pz-wave pairing symmetry, a line nodal exists in the kz=0 plane, confirming the system as a topological nodal-line superconductor. When considering an open boundary along the z-direction, flat surface bands emerge. In contrast, when an s-wave pairing symmetry is considered, the system becomes fully gapped and topologically trivial. Additionally, we investigate the spectral function and the local density of states, which may be employed to experimentally detect the topological features. |