Twofold Symmetry Observed in Bi$_{2}$Te$_{3}$/FeTe Interfacial Superconductor

• DOI: 10.48550/arxiv.2307.05904
• Publication Date: 2023-01-01
• Authors: Xinru Han; Hailang Qin; Tianluo Pan; Bin Guo; Kaige Shi; Zijin Huang; Jie Jiang; Hangyu Yin; Hongtao He; Fei Ye; Wei-Qiang Chen; Jia‐Wei Mei; Gan Wang
• Keywords: Superconductivity (cond-mat.supr-con); Condensed Matter - Strongly Correlated Electrons; Strongly Correlated Electrons (cond-mat.str-el); Condensed Matter - Superconductivity; FOS: Physical sciences

Superconducting pairing symmetry are crucial in understanding the microscopic superconducting mechanism of a superconductor. Here we report observation twofold gap an interfacial superconductor Bi$_{2}$Te$_{3}$/FeTe, by employing quasiparticle interference (QPI) technique scanning tunneling microscopy and macroscopic magnetoresistance measurements. The QPI patterns corresponding to energies inside outside reveal clear anisotropic gap. Furthermore, both in-plane angle-dependent upper critical field exhibit symmetry. This align with Te-Te direction FeTe, which weakens possible generation bi-collinear antiferromagnetism order. Our finding provides key information further topological properties Bi$_{2}$Te$_{3}$/FeTe system propels theoretical interests paring system.