Experimental evidence of monolayer 
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 with symmetry-protected Dirac cones

Geng, Daiyu; Yu, Kejun; Yue, Shaosheng; Cao, Jianwu; Li, Wenbin; Ma, Da-Shuai; Cui, Chaoxi; Arita, Masashi; Kumar, Shiv; Schwier, Eike F.; Shimada, Kenya; Cheng, Peng; Chen, Lan; Wu, Kehui; Yao, Yugui; Feng, Baojie

doi:10.1103/physrevb.101.161407

Cited by 25 publications

(32 citation statements)

References 30 publications

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“…In full agreement with the previous reports, , deposition of sub-ML quantities of boron on Al(111) at a substrate temperature around 180 °C results in the formation of HB islands decorated by a typical triangular superstructure, as can be seen in the STM images of Figure a and b. This moiré superstructure is reflected also in the LEED pattern as extra spots surrounding the original Al(111) spots (left part of Figure c).…”

Section: Resultssupporting

confidence: 91%

“…This, in combination with large-scale calculations, can help to reveal the exact atomic arrangement of HB on Al(111) and the nature of observed triangular corrugation, which remains unclear. Recently a study of the electronic structure of HB on Al(111) by angle-resolved photoemission spectroscopy (ARPES) revealed several Dirac cones in the band structure, which were interpreted as signatures of an AlB 2 surface layer weakly bonded to the underlying Al(111) substrate . On the other hand, a large difference in the B–Al layer separation and the B adhesion energy between favorable (fcc-hcp) and unfavorable (top-fcc and top-hcp) adsorption sites may be indicative of a corrugated HB sheet, somewhat similar to graphene on lattice-mismatched substrates …”

Section: Introductionmentioning

confidence: 99%

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Honeycomb Boron on Al(111): From the Concept of Borophene to the Two-Dimensional Boride

et al. 2021

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A great variety of two-dimensional (2D) boron allotropes (borophenes) were extensively studied in the past decade in the quest for graphene-like materials with potential for advanced technological applications. Among them, the 2D honeycomb boron is of specific interest as a structural analogue of graphene. Recently it has been synthesized on the Al(111) substrate; however it remains unknown to what extent does honeycomb boron behave like graphene. Here we elucidate the structural and electronic properties of this unusual 2D material with a combination of core-level X-ray spectroscopies, scanning tunneling microscopy, and DFT calculations. We demonstrate that in contrast to graphene on lattice-mismatched metal surfaces, honeycomb boron cannot wiggle like a blanket on Al(111), but rather induces reconstruction of the top metal layer, forming a stoichiometric AlB2 sheet on top of Al. Our conclusions from theoretical modeling are fully supported by X-ray absorption spectra showing strong similarity in the electronic structure of honeycomb boron on Al(111) and thick AlB2 films. On the other hand, a clear separation of the electronic states of the honeycomb boron into π- and σ-subsystems indicates an essentially 2D nature of the electronic system in both one-layer AlB2 and bulk AlB2.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Honeycomb Boron on Al(111): From the Concept of Borophene to the Two-Dimensional Boride

et al. 2021

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“…Therefore, we do not expect to observe symmetry protected nodal lines in this structure. The existence of the p−type Dirac Fermions in this configuration has been confirmed by recent experimental ARPES measurements [60] which provides an excellent platform for designing new nanoelectronics.…”

Section: Author Contributionsmentioning

confidence: 54%

“…Although, group theory analysis of the energy bands unveils that there exist some topologically protected Dirac points along the high symmetry lines in the BZ of this structure, the absence of the in-plane mirror symmetry reduces the point group of the system to C 6v and thus prevents formation of any nodal line feature in the momentum space (See Supplementary Note 4). It is worth mentioning that the monolayer AlB 2 with a B-terminated surface has been recently synthesized on Al(111) [60] and the existence of the p-type Dirac Fermions in this configuration was confirmed by the recent experimental ARPES measurements [60]. This may serve as a possible way to explore our predicted topological NLSM states in aluminum diborides thin films with in-plane mirrors.…”

Section: (A) and (E))mentioning

confidence: 58%

“…In addition, recent ARPES measurements on a typical cleaved (001) surface of AlB 2 revealed the feasibility of both B-and Al-terminations [59]. In a similar work, a B-terminated monolayer of AlB 2 was successfully synthesized on Al(111) via molecular beam epitaxy [60]. These experimental works, evidence the feasibility of aluminum diboride thin films with the desired terminations.…”

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confidence: 72%

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Al$_2$B$_2$ and AlB$_4$ monolayers: emergence of multiple two-dimensional Dirac nodal line semimetals with novel properties

Abedi,

Sisakht,

Hashemifar

et al. 2021

Preprint

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Topological semimetal phases in two-dimensional (2D) materials have gained widespread interest due to their potential applications in developing nanoscale devices. Despite the prediction of the Dirac/Weyl points in a wide variety of 2D candidates, materials featuring topological nodal lines are still in great scarcity. Herein, we predict two stable thinnest films of aluminum diboride with hyperand hypo-stoichiometries of Al2B2 and AlB4 as new 2D nonmagnetic Dirac nodal line semimetals (NLSMs) which promise to offer many novel features. Our elaborate electronic structure calculations combined with analytical studies reveal that, in addition to the multiple Dirac points, these 2D configurations host various type-I closed nodal lines (NLs) around the Fermi level, all of which are semimetal states protected by the time-reversal and in-plane mirror symmetries. The most intriguing NL in Al2B2 encloses the K point and crosses the Fermi level with a considerable dispersion, thus providing a fresh playground to explore exotic properties in dispersive Dirac nodal lines. More strikingly, in the case of 2D superconductor AlB4 which exhibits a high transition temperature, we provide the first evidence for a set of 2D nonmagnetic open type-II NLs in weak spin-orbit coupling limit, coinciding with closed type-I NLs near the Fermi level. The coexistence of superconductivity and nontrivial band topology in AlB4 not only makes it a promising material to exhibit novel topological superconducting phases, but also the rather large energy dispersion of type-II nodal lines in this configuration, may offer a distinguished platform for realization of novel topological features in two-dimensional limit.

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Realization of Regular‐Mixed Quasi‐1D Borophene Chains with Long‐Range Order

et al. 2020

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Recently, monoelemental 2D materials beyond graphene [1-9] have been widely investigated experimentally and theoretically due to their non-trivial physical properties and fascinating potential for future application in nanoscale devices. In particular, the 2D sheet of boron atoms arranged in a triangular lattice with hexagonal holes named borophene has sparked an enormous research effort [10,11] including theoretical predictions of its properties [12-20] and its experimental preparation on metal surfaces. [21-28] Extraordinary properties of borophene have been reported, such as 1D nearly free electron states, [29] presence of

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Experimental evidence of monolayer AlB2 with symmetry-protected Dirac cones

Cited by 25 publications

References 30 publications

Honeycomb Boron on Al(111): From the Concept of Borophene to the Two-Dimensional Boride

Honeycomb Boron on Al(111): From the Concept of Borophene to the Two-Dimensional Boride

Al$_2$B$_2$ and AlB$_4$ monolayers: emergence of multiple two-dimensional Dirac nodal line semimetals with novel properties

Realization of Regular‐Mixed Quasi‐1D Borophene Chains with Long‐Range Order

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