Atomically-thin metallic Si and Ge allotropes with high Fermi velocities

Abstract

Silicon and germanium are the well-known materials used to manufacture electronic devices for the integrated circuits but they themselves are not considered as promising options for interconnecting the devices due to their semiconducting nature. We have discovered that both Si and Ge atoms can form unexpected metallic monolayer structures which are more stable than the extensively studied semimetallic silicene and germanene, respectively. More importantly, the newly discovered two-dimensional allotropes of Si and Ge have Fermi velocities superior to the Dirac fermions in graphene, indicating that the metal wires needed in the silicon-based integrated circuits can be made of Si atom itself without incompatibility, allowing for all-silicon-based integrated circuits.

arXiv comment10 pages, 3 figures, 1 table

References in corpus (15)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Van der Waals heterostructures
• Advanced capabilities for materials modelling with Quantum ESPRESSO
• Two and one-dimensional honeycomb structures of silicon and germanium
• Monolayer honeycomb structures of group IV elements and III-V binary compounds
• Wannier90 as a community code: new features and applications
• Dirac cones reshaped by interaction effects in suspended graphene
• Twistable electronics with dynamically rotatable heterostructures
• 2D Materials for Future Heterogeneous Electronics
• Fermi velocity engineering in graphene by substrate modification
• FermiSurfer: Fermi-surface viewer providing multiple representation schemes
• Ab initio GW many-body effects in graphene
• Self healing of vacancy defects in single layer graphene and silicene
• Tight-binding calculations of optical matrix elements for conductivity using non-orthogonal atomic orbitals: Anomalous Hall conductivity in bcc Fe
• Diverse forms of $\sigma$ bonding in two-dimensional Si allotropes: Nematic orbitals in the $Mo{S}_2$ structure

Cited by in corpus (1)

• Transferability of interatomic potentials for germanene (2D germanium)