Hidden order in URu2Si2 has remained a mystery now entering its 4th decade. The importance of resolving the nature of the hidden order has stimulated extensive research. Here we present a detailed characterization of different surface terminations in URu2Si2 by angle-resolved photoemission spectroscopy, in conjunction with scanning tunneling spectroscopy and DMFT calculations that may unveil a new piece of this puzzle. The U-terminated surface is characterized by an electron-like band around the Xˉ point, while a hole-like band for the Si-terminated surface. We also investigate temperature evolution of the electronic structure around the Xˉ point from 11 K up to 70 K, and did not observe any abrupt change of the electronic structure around the coherence temperature (55 K). The f spectral weight gradually weakens upon increasing temperature, still some f spectral weight can be found above this temperature. Our results suggest that surface terminations in URu2Si2 are an important issue to be taken into account in future work.
@article{arxiv.1809.06998,
title = {ARPES/STM study of the surface terminations and 5$f$-electron character in URu$_2$Si$_2$},
author = {W. Zhang and H. Y. Lu and D. H. Xie and W. Feng and S. Y. Tan and Y. Liu and X. G. Zhu and Y. Zhang and Q. Q. Hao and Y. B. Huang and X. C. Lai and Q. Y. Chen},
journal= {arXiv preprint arXiv:1809.06998},
year = {2018}
}