The surface phase transition and low-temperature phase of α-Ga(0 1 0) studied by SPA-LEED

Lizzit, Silvano; Baraldi, Alessandro; Grütter, Ch.; Bilgram, J. H.; Hofmann, Philip

doi:10.1016/j.susc.2009.09.006

Cited by 9 publications

(6 citation statements)

References 16 publications

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“…By using micro-low-energy electron diffraction (μ-LEED) (aperture size 500 nm), we confirm that the crystallographic structure of these islands is of black-phosphorus-type (see top inset in Figure a, recorded on an island shown in Figure a) rather than, for example, possible hexagonal structures. , Close inspection of the μ-LEED pattern reveals the very weak intensity of the (10) spots, which is the result of glide-line symmetry along the ⟨1̅10⟩ direction (in rhombohedral indices, for a ball-and-stick model, see Figure b). Detailed analysis on the LEED intensity pattern indicates that the two atoms in each layer in the unit cell are at nearly the same height; the surface buckling is small, with a deformation Δ z around 0.04 ± 0.005 Å; please see the Supporting Information for a detailed discussion.…”

Section: Resultsmentioning

confidence: 99%

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Realization of Symmetry-Enforced Two-Dimensional Dirac Fermions in Nonsymmorphic α-Bismuthene

et al. 2020

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Two-dimensional (2D) Dirac-like electron gases have attracted tremendous research interest ever since the discovery of free-standing graphene [1-3]. The linear energy dispersion and non-trivial Berry phase play the pivotal role in the remarkable electronic, optical, mechanical and chemical properties of 2D Dirac materials [4]. The known 2D Dirac materials are gapless only within certain approximations, for example, in the absence of SOC. Here we report a route to establishing robust Dirac cones in 2D materials with nonsymmorphic crystal lattice. The nonsymmorphic symmetry enforces Dirac-like band dispersions around certain high-symmetry momenta in the presence of SOC [5, 6]. Through µ-ARPES measurements we observe Dirac-like band dispersions in α-bismuthene. The nonsymmorphic lattice symmetry is confirmed by µ-LEED and STM. Our firstprinciples simulations and theoretical topological analysis demonstrate the correspondence between nonsymmorphic symmetry and Dirac states. This mechanism can be straightforwardly generalized to other nonsymmorphic materials. The results open the door for the search of symmetry enforced Dirac fermions in the vast uncharted world of nonsymmorphic 2D materials.

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Section: Resultsmentioning

confidence: 99%

“…1a). Close inspection of the µ-LEED pattern reveals the very weak intensity of the (10) spots, which is the result of glide-line symmetry along the 1 10 direction [22] (rhombohedral indices, see Fig. 1b).…”

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confidence: 99%

Realization of Symmetry-Enforced Two-Dimensional Dirac Fermions in Nonsymmorphic α-Bismuthene

et al. 2020

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“…SPA-LEED was performed at the Surface Science Laboratory of Elettra Sincrotrone Trieste using a commercial Omicron SPA-LEED with a transfer width better than 1000 Å. 41 The instrument was used both to acquire high-quality two-dimensional reciprocal space maps at a fixed energy and to measure onedimensional high-resolution profiles along specific reciprocal space directions. Reciprocal space lengths in the SPA-LEED scans are given in units of Å À1 and were calibrated using the known lattice parameter of Ir(111).…”

Section: Methodsmentioning

confidence: 99%

Epitaxial Growth of a Single-Domain Hexagonal Boron Nitride Monolayer

et al. 2014

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We investigate the structure of epitaxially grown hexagonal boron nitride (h-BN) on Ir(111) by chemical vapor deposition of borazine. Using photoelectron diffraction spectroscopy, we unambiguously show that a single-domain h-BN monolayer can be synthesized by a cyclic dose of high-purity borazine onto the metal substrate at room temperature followed by annealing at T=1270 K, this method giving rise to a diffraction pattern with 3-fold symmetry. In contrast, high-temperature borazine deposition (T=1070 K) results in a h-BN monolayer formed by domains with opposite orientation and characterized by a 6-fold symmetric diffraction pattern. We identify the thermal energy and the binding energy difference between fcc and hcp seeds as key parameters in controlling the alignment of the growing h-BN clusters during the first stage of the growth, and we further propose structural models for the h-BN monolayer on the Ir(111) surface.

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“…The surface normal, the incident beam, and the electron emission direction were all in the horizontal plane, with the angle between the photon beam and the electron energy analyser fixed at 70 • . The high resolution core level spectra were acquired at normal electron emission.SPA-LEED measurements were carried out at the Surface Science Laboratory of Elettra Sincrotrone Trieste using a commercial Omicron SPA-LEED[47]. The transfer width was better than 1000Å.…”

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confidence: 99%

Epitaxial growth of single-orientation high-quality MoS ₂ monolayers

et al. 2018

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We present a study on the growth and characterization of high-quality single-layer MoS 2 with a single orientation, i.e. without the presence of mirror domains. This single orientation of the MoS 2 layer is established by means of x-ray photoelectron diffraction. The high quality is evidenced by combining scanning tunneling microscopy with x-ray photoelectron spectroscopy measurements.Spin-and angle-resolved photoemission experiments performed on the sample revealed complete spin-polarization of the valence band states near the K and -K points of the Brillouin zone. These findings open up the possibility to exploit the spin and valley degrees of freedom for encoding and processing information in devices that are based on epitaxially grown materials.

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The surface phase transition and low-temperature phase of α-Ga(0 1 0) studied by SPA-LEED

Cited by 9 publications

References 16 publications

Realization of Symmetry-Enforced Two-Dimensional Dirac Fermions in Nonsymmorphic α-Bismuthene

Realization of Symmetry-Enforced Two-Dimensional Dirac Fermions in Nonsymmorphic α-Bismuthene

Epitaxial Growth of a Single-Domain Hexagonal Boron Nitride Monolayer

Epitaxial growth of single-orientation high-quality MoS ₂ monolayers

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The surface phase transition and low-temperature phase of α-Ga(0 1 0) studied by SPA-LEED

Cited by 9 publications

References 16 publications

Realization of Symmetry-Enforced Two-Dimensional Dirac Fermions in Nonsymmorphic α-Bismuthene

Realization of Symmetry-Enforced Two-Dimensional Dirac Fermions in Nonsymmorphic α-Bismuthene

Epitaxial Growth of a Single-Domain Hexagonal Boron Nitride Monolayer

Epitaxial growth of single-orientation high-quality MoS 2 monolayers

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Product

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Epitaxial growth of single-orientation high-quality MoS ₂ monolayers