Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 23: Topological Insulators and Weyl Semimetals (joint session MA/TT)

TT 23.3: Vortrag

Dienstag, 19. März 2024, 10:00–10:15, H 2013

Behavior of Dirac Fermions in Kondo lattice systems — •Kalobaran Maiti — Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India

We studied the behavior of Dirac fermions in novel Kondo lattice system employing ARPES. We show that a binary system, SmBi show signature of multiple gapped and un-gapped Dirac cones in the band structure. Employing ultra-high-resolution ARPES, we discover destruction of a surface Fermi surface across the Neel temperature while the behavior of Dirac cones survive across the magnetic transition. ARPES data of a non-symmorphic Kondo lattice system, CeAgSb2 exhibit distinct Dirac cones as well as diamond-shaped nodal lines; the slope of these linear bands is unusually high, larger than that in graphene and maintains its high value in a wide energy range indicating robust high velocity of these relativistic particles. The slope becomes smaller in the vicinity of strongly correlated Ce 4f bands forming a kink; a unique case due to correlation induced effects.

References: 1. Sawani Datta et al., arXiv:2311.05278 2. A.P. Sakhya et al. Phys. Rev. Mater. 2021, 5, 054201. 3. A.P. Sakhya et al. Phys. Rev. B 2022, 106, 085132.

Keywords: Kondo lattice system; Topological materials; ARPES; Density functional theory; Magnetism