Direct evidence of metallic bands in a monolayer boron sheet

Feng, Baojie; Zhang, Jin; Liu, Ro-Ya; Iimori, Takushi; Lian, Chao; Li, Hui; Chen, Lan; Wu, Kehui; Meng, Sheng; Komori, Fumio; Matsuda, Iwao

doi:10.1103/physrevb.94.041408

Cited by 183 publications

(149 citation statements)

References 33 publications

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“…Considering the intrinsic metallic behavior with high DOS at E F (N (E F )) verified by different reports [28,32,33], one can expect for the possibility of superconductivity in this pristine monolayer material. Recently Gao et al [34] and Penev et al [33] respectively predicted the phonon-mediated superconductivity with T c of 10∼20 K for the reported structures with vacancy fraction x = 0, 1/5, 1/6 and 1/3 [28,33,[35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Enhanced superconductivity by strain and carrier-doping in borophene: A first principles prediction

Xiao

Shao

et al. 2016

Applied Physics Letters

121

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We predict by first principles calculations that the recently prepared borophene is a pristine twodimensional (2D) monolayer superconductor, in which the superconductivity can be significantly enhanced by strain and charge carrier doping. The intrinsic metallic ground state with high density of states at Fermi energy and strong Fermi surface nesting lead to sizeable electron-phonon coupling, making the freestanding borophene superconduct with Tc close to 19.0 K. The tensile strain can increase Tc to 27.4 K, while the hole doping can notably increase Tc to 34.8 K. The results indicate that the borophene grown on substrates with large lattice parameters or under photoexcitation can show enhanced superconductivity with Tc far more above liquid hydrogen temperature of 20.3 K, which will largely broaden the applications of such novel material.

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Section: Introductionmentioning

confidence: 99%

Enhanced superconductivity by strain and carrier-doping in borophene: A first principles prediction

Xiao

Shao

et al. 2016

Applied Physics Letters

121

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“…Fortunately, a breakthrough was just made that boron sheets can be grown on the Ag (111) surface under pristine ultra-high vacuum conditions or on copper foils by using chemical vapor deposition (CVD). [26][27][28][29] To resolve the crystal structures of several samples, 26 we focused on some lowenergy 2D structures with hexagonal or rectangular symmetry, which should match the lattice of Ag (111) substrate very well. This resulted in a serendipitous discovery of M -boron.…”

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confidence: 99%

Two-dimensional magnetic boron

et al. 2016

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We predict a two-dimensional (2D) antiferromagnetic (AFM) boron (designated as M -boron) by using ab initio evolutionary methodology. M -boron is entirely composed of B20 clusters in a hexagonal arrangement. Most strikingly, the highest valence band of M -boron is isolated, strongly localized, and quite flat, which induces spin polarization on either cap of the B20 cluster. This flat band originates from the unpaired electrons of the capping atoms, and is responsible for magnetism. M -boron is thermodynamically metastable and is the first magnetic 2D form of elemental boron.

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“…For example, while all existing 3D boron allotropes are semiconducting at standard conditions, borophenes show metallic characteristic [30][31][32] , which also distinguishes them from other well studied 2D materials usually having bandgaps. Among the properties borophenes may offer, their mechanical properties are of particular interest and importance.…”

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confidence: 99%

Elasticity, Flexibility, and Ideal Strength of Borophenes

Zhang

Yang

Penev

et al. 2017

Adv Funct Materials

268

199

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ABSTRACT:We study the mechanical properties of two-dimensional (2D) boron-borophenes -by first-principles calculations. The recently synthesized borophene with 1/6 concentration of hollow hexagons (HH) is shown to have in-plane modulus C up to 210 N/m and bending stiffness as low as D = 0.39 eV. Thus, its Foppl-von Karman number per unit area, defined as C/D, reaches 568 nm -2 , over twofold higher than graphene's value, establishing the borophene as one of the most flexible materials. Yet, the borophene has a specific modulus of 346 m 2 /s 2 and ideal strengths of 16 N/m, rivaling those (453 m 2 /s 2 and 34 N/m) of graphene. In particular, its structural fluxionality enabled by delocalized multi-center chemical bonding favors structural phase transitions under tension, which result in exceptionally small breaking strains yet highly ductile breaking behavior. These mechanical properties can be further tailored by varying the HH concentration, and the boron sheet without HHs can even be stiffer than graphene against tension. The record high flexibility combined with excellent elasticity in boron sheets can be utilized for designing composites and flexible systems.

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Direct evidence of metallic bands in a monolayer boron sheet

Cited by 183 publications

References 33 publications

Enhanced superconductivity by strain and carrier-doping in borophene: A first principles prediction

Enhanced superconductivity by strain and carrier-doping in borophene: A first principles prediction

Two-dimensional magnetic boron

Elasticity, Flexibility, and Ideal Strength of Borophenes

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