Recent experiments show strong evidences of nematic triplet superconductivity in doped Bi2Se3 and in Bi2Te3 thin film on a superconducting substrate, but with varying identifications of the direction of the d-vector of the triplet that is essential to the topology of the underlying superconductivity. Here we show that the d-vector can be directly visualized by scanning tunneling measurements: At subgap energies the d-vector is along the leading peak wave-vector in the quasi-particle-interference pattern for potential impurities, and counter-intuitively along the elongation of the local density-of-state profile of the vortex. The results provide a useful guide to experiments, the result of which would in turn pose a stringent constraint on the pairing symmetry.
@article{arxiv.1804.10148,
title = {Visualizing the $d$-vector in a nematic triplet superconductor},
author = {Wei-Cheng Bao and Qing-Kun Tang and Da-Chuan Lu and Qiang-Hua Wang},
journal= {arXiv preprint arXiv:1804.10148},
year = {2018}
}