Single-layer dual germanene phases on Ag(111)

Lin, Chung Huang; Huang, Angus; Pai, Woei Wu; Chen, Wei Chuan; Chen, Ting Yu; Chang, Tay-Rong; Yukawa, Ryu; Cheng, Cheng Maw; Mou, Chung‐Yu; Matsuda, Ichiro; Chiang, T.‐C.; Jeng, Horng Tay; Tang, S.-J.

doi:10.1103/physrevmaterials.2.024003

Cited by 80 publications

(72 citation statements)

References 32 publications

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“…Some satellite features around the substrate spots and the spots of the -reconstruction were observed, which are attributed to a tensile strain along the zigzag and the armchair direction of the Ge-superstructure, as reported by Lin et al. 32 . This strain leads to a modulation in the electron density which was observed as stripes in several STM studies 26 , 28 , 32 , 35 , 45 .…”

Section: Resultssupporting

confidence: 71%

“… 32 . This strain leads to a modulation in the electron density which was observed as stripes in several STM studies 26 , 28 , 32 , 35 , 45 . Many descriptions of this superstructure for the striped phase have been published 26 , 29 , 31 .…”

Section: Resultsmentioning

confidence: 99%

“…However, this alloy phase at a layer thickness of germanium is still controversially discussed to form reconstructions of a 25 – 28 , a 29 , a with a Moiré pattern of 30 , or a rectangular 31 . It was also considered as a striped phase (SP) due to tensile strains of the uppermost layer 32 with a long-range order of 26 . Then, after passing a mixed phase, the germanene arranges at a coverage of 32 , whose superstructure might be described as a 23 , a 29 , 33 , or a 34 , 35 with a long-range order of 34 , 36 .…”

Section: Introductionmentioning

confidence: 99%

“…It was also considered as a striped phase (SP) due to tensile strains of the uppermost layer 32 with a long-range order of 26 . Then, after passing a mixed phase, the germanene arranges at a coverage of 32 , whose superstructure might be described as a 23 , a 29 , 33 , or a 34 , 35 with a long-range order of 34 , 36 . The large number of recently published controversial studies and results on what phases are formed and what they are called do not proceed the understanding of the structural formation process of germanene on Ag(111).…”

Section: Introductionmentioning

confidence: 99%

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Tracing the structural evolution of quasi-freestanding germanene on Ag(111)

Kesper

Hochhaus

Schmitz

et al. 2022

Sci Rep

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In the last decade, research on 2D materials has expanded massively due to the popularity of graphene. Although the chemical engineering of two-dimensional elemental materials as well as heterostructures has been extensively pursued, the fundamental understanding of the synthesis of 2D materials is not yet complete. Structural parameters, such as buckling or the interface structure of a 2D material to the substrate directly affect its electronic characteristics. In order to proceed the understanding of the element-specific growth and the associated ability of tuning material properties of two-dimensional materials, we performed a study on the structural evolution of the promising 2D material germanene on Ag(111). This study provides a survey of germanium formations at different layer thicknesses right up to the arising of quasi-freestanding germanene. Using powerful surface analysis tools like low-energy electron diffraction, x-ray photoelectron spectroscopy, and x-ray photoelectron diffraction with synchrotron radiation, we will reveal the internal and interfacial structure of all discovered germanium phases. Moreover, we will present models of the atomic and chemical structure of a $$\hbox {Ag}_2\hbox {Ge}$$ Ag 2 Ge surface alloy and the quasi-freestanding germanene with special focus on the structural parameters and electronic interaction at the interface.

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Section: Resultssupporting

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tracing the structural evolution of quasi-freestanding germanene on Ag(111)

Kesper

Hochhaus

Schmitz

et al. 2022

Sci Rep

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“…In particular, it is known that the linear dispersive electronic band of graphene, which is called Dirac electron, and the topological properties of the wave function around it play an important role in the unique physical properties of graphene. Recently, as an analog of graphene, honeycomb-lattice materials with other atoms (Xenes) such as silicene [ 7 , 8 , 9 , 10 , 11 ], phosphorene [ 12 , 13 , 14 , 15 , 16 ], germanene [ 11 , 17 , 18 , 19 ], arsenene [ 14 , 20 , 21 ], antimonene [ 14 , 20 , 22 ], and bismuthene [ 14 , 23 , 24 ], have also been actively studied. These materials are expected to be a new platform to explore unique physical properties qualitatively different from those of graphene, taking advantage of the difference in model parameters such as the strength of spin–orbit interaction.…”

Section: Introductionmentioning

confidence: 99%

Electronic Structures of Polymorphic Layers of Borophane

2022

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The search for free-standing 2D materials has been one of the most important subjects in the field of studies on 2D materials and their applications. Recently, a free-standing monolayer of hydrogenated boron (HB) sheet has been synthesized by hydrogenation of borophene. The HB sheet is also called borophane, and its application is actively studied in many aspects. Here, we review recent studies on the electronic structures of polymorphic sheets of borophane. A hydrogenated boron sheet with a hexagonal boron frame was shown to have a semimetallic electronic structure by experimental and theoretical analyses. A tight-binding model that reproduces the electronic structure was given and it allows easy estimation of the properties of the material. Hydrogenated boron sheets with more complicated nonsymmorphic boron frames were also analyzed. Using the symmetry restrictions from the nonsymmorphic symmetry and the filling factor of hydrogenated boron sheets, the existence of a Dirac nodal line was suggested. These studies provide basic insights for research on and device applications of hydrogenated boron sheets.

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