Germanene: a novel two-dimensional germanium allotrope akin to graphene and silicene
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TLDR
In this article, an atom-thin, ordered, two-dimensional multi-phase film was grown in situ through germanium molecular beam epitaxy using a gold surface as a substrate.Abstract:
We have grown an atom-thin, ordered, two-dimensional multi-phase film in situ through germanium molecular beam epitaxy using a gold (111) surface as a substrate. Its growth is similar to the formation of silicene layers on silver (111) templates. One of the phases, forming large domains, as observed in scanning tunneling microscopy, shows a clear, nearly flat, honeycomb structure. Thanks to thorough synchrotron radiation core-level spectroscopy measurements and advanced density functional theory calculations we can identify it as a ?3????3 R(30?) germanene layer in conjunction with a ?7????7 R(19.1?) Au(111) supercell, presenting compelling evidence of the synthesis of the germanium-based cousin of graphene on gold.read more
Citations
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Effects of mechanical strain on the performance of germanene sheets: Strength, failure behavior, and electronic structure
Ning Ding,Ning Ding,Huan Wang,Long Liu,Weimin Guo,Xiangfeng Chen,Chi-Man Lawrence Wu,Chi-Man Lawrence Wu +7 more
TL;DR: In this paper, the stabilities, mechanical properties, and changes in electronic properties under mechanical strain for both pristine and defective germanene sheets were studied and analyzed with use of density functional theory.
Journal ArticleDOI
Van der Waals heterostructures with spin-orbit coupling
Enrico Rossi,Christopher Triola +1 more
TL;DR: In this article, a general effective model to describe the low energy electronic degrees of freedom in van der Waals (vdW) systems was presented and applied to study the case of (vdw) systems formed by a graphene sheet and a topological insulator.
Journal ArticleDOI
Patterning germanene into superlattices: An efficient method for tuning conducting properties
Shu-Juan Li,Yan Su,Gang Chen +2 more
TL;DR: In this article, the authors investigated the electronic properties of germanene superlattices and showed that the bandgap can only be opened in some inversion symmetry preserved super lattices with Γ as four-fold degenerate Dirac point.
Journal ArticleDOI
Time-Dependent Density Functional Theory Investigation on the Electronic and Optical Properties of Poly-C,Si,Ge-acenes.
TL;DR: A comparative computational investigation on the first six members of linear poly-C,Si,Ge-acenes is reported, finding a linear relationship for the wavelength-dependence of the β peaks as a function of the number of rings.
Journal ArticleDOI
Growth of two-dimensional Ge crystal by annealing of heteroepitaxial Ag/Ge(111) under N2 ambient
Koichi Ito,Akio Ohta,Masashi Kurosawa,Masaaki Araidai,Mitsuhisa Ikeda,Katsunori Makihara,Seiichi Miyazaki +6 more
TL;DR: In this paper, the growth of a two-dimensional crystal of Ge atoms on an atomically flat Ag(111) surface has been demonstrated by the thermal annealing of a heteroepitaxial Ag/Ge structure in N2 ambient at atmospheric pressure.
References
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Two- and one-dimensional honeycomb structures of silicon and germanium.
TL;DR: In this paper, first-principles calculations of structure optimization, phonon modes, and finite temperature molecular dynamics predict that silicon and germanium can have stable, two-dimensional, low-buckled, honeycomb structures.
Journal Article
Two- and one-dimensional honeycomb structures of silicon and germanium
TL;DR: First-principles calculations of structure optimization, phonon modes, and finite temperature molecular dynamics predict that silicon and germanium can have stable, two-dimensional, low-buckled, honeycomb structures, which show remarkable electronic and magnetic properties, which are size and orientation dependent.
Journal ArticleDOI
Quantum spin Hall effect in silicene and two-dimensional germanium.
TL;DR: It is demonstrated that silicene with topologically nontrivial electronic structures can realize the quantum spin Hall effect (QSHE) by exploiting adiabatic continuity and the direct calculation of the Z(2) topological invariant.
Journal ArticleDOI
Experimental Evidence for Epitaxial Silicene on Diboride Thin Films
Antoine Fleurence,Rainer Friedlein,Taisuke Ozaki,Hiroyuki Kawai,Ying Wang,Yukiko Yamada-Takamura +5 more
TL;DR: It is shown that two-dimensional, epitaxial silicene forms through surface segregation on zirconium diboride thin films grown on Si wafers and that the buckling and thus the electronic properties of silicenes are modified by epitaxials strain.
Journal ArticleDOI
Low-energy effective Hamiltonian involving spin-orbit coupling in silicene and two-dimensional germanium and tin
TL;DR: In this article, the authors derived the low energy effective Hamiltonian involving spin-orbit coupling (SOC) for silicene, which is the analog to the graphene quantum spin Hall effect (QSHE) Hamiltonian.
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