Evidence of electron correlation induced kink in Dirac bands in a non-symmorphic Kondo lattice system, CeAgSb2

Autor:	Datta, Sawani, Ali, Khadiza, Verma, Rahul, Singh, Bahadur, Dash, Saroj P., Thamizhavel, A., Maiti, Kalobaran
Rok vydání:	2023
Předmět:	Condensed Matter - Strongly Correlated Electrons
Druh dokumentu:	Working Paper
Popis:	We study the behavior of Dirac fermions in the presence of electron correlation in a nonsymmorphic Kondo lattice system, CeAgSb2 employing high-resolution angle-resolved photoemission spectroscopy and first-principles calculations. Experiments reveal crossings of highly dispersive linear bands at the Brillouin zone boundary due to non-symmorphic symmetry. In addition, anisotropic Dirac cones are observed constituted by the squarenet Sb 5p states forming a diamond-shaped nodal line. The Dirac bands are linear in a wide energy range with a unusually high slope and exhibit distinct Dirac point in this highly spin-orbit coupled system. Interestingly, the linearity of the bands are preserved even after the hybridization of these states with the local Ce 4f states, which leads to a small reduction of slope via formation of a 'kink'. These results seed the emergence of an area of robust topological fermions even in presence of strong correlation. Comment: 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2311.05278 Zobrazit plný text záznamu View this record from Arxiv