Correlated singular flat bands on the surface pentagonal lattice of ferromagnetic CoS2
Flat bands have been proposed in various geometrically frustrated lattices, yet their experimental realization has been limited only to the two-dimensional (2D) kagome and three-dimensional (3D) pyrochlore lattices. While synthesizing bulk crystals with desired lattice geometry is generally challenging, the surfaces of 3D bulk materials sometimes naturally host 2D lattice structures hardly achievable in 2D bulk crystals. Thus, the electrons localized on such 2D surfaces can b
Scientists have experimentally observed unique flat electronic bands on the surface of a ferromagnetic material called CoS2. These bands are located on a two-dimensional pentagonal lattice, a structure not easily created in bulk form. The researchers found that these surface bands interact with the material's bulk electronic bands, leading to unusual electronic behavior. This behavior includes a scattering rate that changes linearly with temperature and significant broadening of the quasiparticles.
This discovery opens up new avenues for studying exotic electronic phenomena in materials with pentagonal lattice structures, potentially leading to advancements in condensed matter physics and materials science.
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