Recently, HfSiS was found to be a new type of Dirac semimetal with a line of Dirac nodes in the band structure. Meanwhile, Rashba-split surface states are also pronounced in this compound. Here we report a systematic study of HfSiS by scanning tunneling microscopy/spectroscopy at low temperature and high magnetic field. The Rashba-split surface states are characterized by measuring Landau quantization and standing waves, which reveal a quasi-linear dispersive band structure. First-principles calculations based on density-functional theory are conducted and compared with the experimental results. Based on these investigations, the properties of the Rashba-split surface states and their interplay with defects and collective modes are discussed.
@article{arxiv.1805.09691,
title = {Observation of Landau quantization and standing waves in HfSiS},
author = {L. Jiao and Q. N. Xu and Y. P. Qi and S. -C. Wu and Y. Sun and C. Felser and S. Wirth},
journal= {arXiv preprint arXiv:1805.09691},
year = {2018}
}