Charge 4e superconductor: A wavefunction approach.

• DOI: 10.48550/arxiv.2209.13905
• Publication Date: 2024-08-01
• Authors: Li, Pengfei; Jiang, Kun; Hu, Jiangping
• Keywords: Superconductivity (cond-mat.supr-con); Condensed Matter - Strongly Correlated Electrons; Strongly Correlated Electrons (cond-mat.str-el); Condensed Matter - Superconductivity; 0103 physical sciences; FOS: Physical sciences; 01 natural sciences

We apply a wavefunction approach to study the charge 4$e$ superconductor. The wavefunction takes a similar structure to the BCS wavefunction for charge 2$e$ superconductors. The mean-field Hamiltonian and the Green's functions of charge 4$e$ are constructed. The physical properties including the density of states, gauge invariance, flux quantization, superfluid density and Josephson effects are systematically studied. All these results form a microscopic description of the charge 4$e$ SC and can be served as the hallmarks for experimental verifications.<br/>3 pages, 1 figures in the main text<br/>