Two and one-dimensional honeycomb structures of silicon and germanium

Abstract

Based on first-principles calculations of structure optimization, phonon modes and finite temperature molecular dynamics, we predict that silicon and germanium have stable, two-dimensional, low-buckled, honeycomb structures. Similar to graphene, they are ambipolar and their charge carriers can behave like a massless Dirac fermions due to their pi- and pi*-bands which are crossed linearly at the Fermi level. In addition to these fundamental properties, bare and hydrogen passivated nanoribbons of Si and Ge show remarkable electronic and magnetic properties, which are size and orientation dependent. These properties offer interesting alternatives for the engineering of diverse nanodevices.

4 pages, 3 figures and 1 table. (published in Physical Review Letters)

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• Aharonov-Bohm oscillations of four-probe resistance in topological quantum rings in silicene and bilayer graphene
• Two-Dimensional Si-Ge Monolayers: Stabilities, Structures and Electronic Properties
• Topologically protected wave packets and quantum rings in silicene
• Two-dimensional anisotropic Dirac materials PtN4C2 and Pt2N8C6 with quantum spin and valley Hall effects
• Frequency-dependent Faraday and Kerr rotation in anisotropic nonsymmorphic Dirac semimetals
• Silicene Like Domains on IrSi3 Crystallites
• Electronic structure of single-wall silicon nanotubes and silicon nanorribons: Helical symmetry treatment and effect of dimensionality
• Identifying the Alloy Structures of Germanene Grown on Al(111) Surface
• Atomically thin mononitrides SiN and GeN: new two-dimensional semiconducting materials
• Kane-Like Electrons in Type II/III Heterostructures versus Dirac-Like Electrons in Graphene
• High-buckled R3 stanene with topologically nontrivial energy gap
• The electronic structure and intervalley coupling of artificial and genuine graphene superlattice
• Chiral properties of topological-state loops
• Atomically-thin metallic Si and Ge allotropes with high Fermi velocities
• Two-Dimensional Multifunctional Materials from Endohedral Fullerenes
• Enhanced in-plane ferroelectricity, antiferroelectricity, and unconventional 2D emergent fermions in QL-XSbO${}_2$ (X= Li, Na)
• Molecular dynamics simulation of melting of finite and inifinite size graphene
• Strain-induced energy band gap opening in two-dimensional bilayered silicon film
• Moiré-modulated band gap and van Hove singularities in twisted bilayer germanene
• Transferability of force fields for 2D silicon (silicene)
• An effective model for the electronic and optical properties of stanene
• A simple rule for finding Dirac Cones in Bilayered Perovskites
• Stable Ultra-thin CdTe Crystal: A Robust Direct Gap Semiconductor
• Variable Coupling Strength of Silicene on Ag(111)
• Photon Absorption of Two-dimensional Nonsymmorphic Dirac Semimetals
• Metal-Insulator transition in strained Graphene: A quantum Monte carlo study
• Tailoring topological states in silicene using different halogen-passivated Si(111) substrates
• Bandgap engineering in an epitaxial two-dimensional honeycomb Si${}_{6-x}$Ge${}_x$ alloy
• Interaction effects in a two-dimensional AlSi${}_6$P nanosheet: A first-principles study on the electronic, mechanical, thermal, and optical properties
• Two-dimensional Dirac fermion in presence of an asymmetric vector potential
• Non-Euclidean geometry, nontrivial topology and quantum vacuum effects
• Adiabatic approximation for a uniform DC electric field
• Possible Realization of Kitaev Spin Liquids in van der Waals Heterostructures of $\alpha$-RuCl${}_3$ and Cr$X_3$ ($X$=Cl and I)
• Electron-Energy-Loss Spectra of Free-Standing Silicene
• Disorder induced lifetime effects in binary disordered systems : a first principles formalism and an application to doped Graphene
• First-principles discovery of stable, anisotropic, semiconducting Sb2X2O (X = S, Se) and Janus Sb2SSeO nanosheets for optoelectronics and photocatalysis
• Large modulation of thermal transport in 2D semimetal triphosphides by doping-induced electron-phonon coupling
• Geometrodynamical description of two-dimensional electrodynamics
• Effects of electron-impurity scattering on density of states in silicene: impurity bands and band-gap narrowing
• Induced vacuum magnetic field in the cosmic string background
• Electronic resistances of multilayered two-dimensional crystal junctions
• Qualitative analysis of magnetic waveguides for two-dimensional Dirac fermions
• Anomalous Transition Magnetic Moments in two-dimensional Dirac Materials
• Moderate bandgap and high carrier mobility simultaneously realized in bilayer silicene by oxidation
• Spin orbit interaction in nanotubes
• DFT+U+V Study of Magnetic Ordering in Single-Layer Pentahexoctite: Implications for Magnetic Device Platforms
• Anomalous Temperature Induced Transition and Convergence of Thermal Conductivity in Germanene Monolayer
• Transferability of interatomic potentials for germanene (2D germanium)
• New stable two dimensional silicon carbide nanosheets
• Magnetism in doped two-dimensional honeycomb structures of III-V binary compounds
• Temperature Dependence of the Response Functions of Graphene: Impact on Casimir and Casimi-Polder Forces in and out of Thermal Equilibrium
• Nanomechanics of Antimonene Allotropes
• Polarization of the vacuum of quantized spinor field by a topological defect in two-dimensional space
• Elastic properties of silicene: Spinodal instabilities
• Quantum nuclear motion in silicene: Assessing structural and vibrational properties through path-integral simulations
• Gate-tunable chiral phonons in low-buckled group-IVA monolayers
• Free Standing Layers of Silicene like Sheets
• Dormitory of Physical and Engineering Sciences: Sleeping Beauties May Be Sleeping Innovations Part 1: Basic Properties, Cognitive Environment, Characteristics of the Princes
• Transition between half-metal and ferromagnetic semiconductor induced by silicon vacancy in epitaxial silicene
• Structure of germanene/Al(111): a two-layers surface alloy
• Realisation of Symmetry Enforced Two-Dimensional Dirac Fermions in Nonsymmorphic $\alpha$-Bismuthene
• Two-dimensional spin-valley-coupled Dirac semimetals in functionalized SbAs monolayers
• Structure of a Zn monolayer on Ag(111) and Ag(110) substrates: an AES, LEED and STM study
• Predicting A Novel Phase of 2D SiTe${}_2$
• Phonon and electronic properties of semiconducting silicon nitride bilayers
• g-SiC6 Monolayer: A New Graphene-like Dirac Cone Material with a High Fermi Velocity
• Two-Dimensional PN Monolayer Sheets with Fantastic Structures and Properties
• Effects of Oxygen Adsorption on the Surface State of Epitaxial Silicene on Ag(111)
• Magnetic control of electron scattering in silicene quantum dots
• Does the Dirac Cone Exist in Silicene on Metal Substrates?
• Enhancement of the thermoelectric properties in bilayer graphene structures induced by Fano resonances
• Tetragonal-phase SnOFeSe: A possible parent compound of FeSe-based superconductor
• The perfect spin injection in silicene FS/NS junction
• Geometrical and electrical modulation on the transport property of silicene constrictions
• Observation of Dirac cone warping and chirality effects in silicene