DOI码：10.1103/PhysRevB.103.165140
发表刊物：Physical Review B
摘要：In the heavy-fermion materials, the characteristic energy scales of many exotic strongly correlated phenomena (Kondo effect, magnetic order, superconductivity, etc.) are at millielectron-volt order, implying that the heavy-fermion materials are surface sensitive. Here, we investigate the electronic structures for Si- and Ce-terminated surfaces of CeRh2⁢Si2 by first-principles methods. Our research reveals three notable impacts of surface effects on electronic structures, which are consistent with recent angle-resolved photoemission spectroscopy experiments. First, the relaxation of surface crystal structures changes the relative position of Fermi level, adjusts the dispersion of bands, and enhances the Kondo resonance. Second, the decrease of the hybridization between the Ce−4⁢�� and conduction electrons in the surface layer leads to a weaker Kondo resonance peak and the shift of spin-orbit bands. Third, the variation of crystal electric field around surface Ce atoms affects the splitting of Kondo resonance peaks, and also pushes down the lower Hubbard bands of surface 4⁢�� electrons. Moreover, we find the characteristic of bulk's lower Hubbard bands, which was overlooked in previous works. Our investigation suggests that these surface effects are potentially important and highlighted in the future researches on properties of strongly correlated materials.
论文类型：期刊论文
是否译文：否
发表时间：2021-01-01
发布期刊链接：https://journals.aps.org/prb/abstract/10.1103/PhysRevB.103.165140