Structural and electronic evidence of boron atomic chains

Quasi-Periodic Growth of One-Dimensional Copper Boride on Cu(110)

“…The atomic structure is inherently commensurate along the [001] direction with the Cu(110) lattice. The bright region in the STM images has the unit length of l 2 = 5.4 Å that can embed 1–3 boron atoms, according to the interatomic boron distances, reported previously . A possible Cu boride model, presented in Figure c, is energetically optimized, and it is confirmed to be stable over a picosecond by the molecular dynamics simulation.…”

“…While the quasi-periodic 1D structure of the B/Cu(110) system requires much effort to unveil the precise atomic structure, the present system may become a significant playground to examine the exotic properties of topological materials. Moreover, previous studies of Cu-Boride on Cu(111) 6 confirmed that the surface phase was arranged of alternating 1-D atomic chains. The relationship between the 1-D boron and the surface is an intriguing issue in metallurgy and boron science.…”

“…The degree of freedom, being specific to a surface, results in the formation of exotic long-range ordered phases such as superstructures and Moiré patterns. This unique environment has opened new research fields and has provided a space to examine interface materials that cannot be explored in a pure 2-D system. − One of the recent findings was a long-range ordered layer of copper boride (Cu-Boride) that was grown incommensurately on the (111) surface of a copper crystal. − This was unexpected because boron has been known to rarely form bulk compounds with group 11 elements. , Moreover, the 2-D copper boride was composed of an alternating array of boron and copper chains, which indicated an intriguing relationship between the 2-D and 1-D atomic structures. An appropriate choice of a 1-D template, such as the Cu (110) surface of the fcc crystal, has enabled us to grow atomic chains. , Thus, a formation of the copper boride interface on Cu(110) is expected to lead to a unique 1-D system that can be characterized with surface-sensitive imaging, such as scanning tunneling microscopy (STM).…”

Accelerated Synthesis of Borophane (HB) Sheets through HCl-Assisted Ion-Exchange Reaction with YCrB4

“…Recently, atomic sheets of boron, known as borophene, were synthesized as a promising counterpart to graphene [ 7 , 8 , 9 ]. In contrast to carbon, boron atoms can combine under diverse bonding schemes, resulting in rich allotropes that display a variety of electronic structures [ 10 , 11 ]. The unique characteristics of 2D boron offer exotic quantum states and intriguing features, such as anisotropic metallicity and phonon-mediated superconductivity [ 12 , 13 , 14 ].…”

“…The unique characteristics of 2D boron offer exotic quantum states and intriguing features, such as anisotropic metallicity and phonon-mediated superconductivity [ 12 , 13 , 14 ]. However, the layers of borophene require epitaxial growth on a crystal surface under a ultrahigh vacuum, a process that is prone to oxidization under ambient conditions [ 11 , 12 , 13 , 14 , 15 ]. This disadvantage makes novel materials made from borophene difficult for industrial applications.…”