Observation of Dirac cone warping and chirality effects in silicene
arXiv:1304.3308
Abstract
We performed low temperature scanning tunneling microscopy (STM) and spectroscopy (STS) studies on the electronic properties of (R3xR3)R30° phase of silicene on Ag(111) surface. We found the existence of Dirac Fermion chirality through the observation of -1.5 and -1.0 power law decay of quasiparticle interference (QPI) patterns. Moreover, in contrast to the trigonal warping of Dirac cone in graphene, we found that the Dirac cone of silicene is hexagonally warped, which is further confirmed by density functional calculations and explained by the unique superstructure of silicene. Our results demonstrate that the (R3xR3)R30° phase is an ideal system to investigate the unique Dirac Fermion properties of silicene.
5 figures
References in corpus (15)
- The electronic properties of graphene
- Chiral tunneling and the Klein paradox in graphene
- A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
- Quantum interference and Klein tunneling in graphene heterojunctions
- Veselago Lens for Electrons: Focusing and Caustics in Graphene p-n Junctions
- Valley-Polarized Metals and Quantum Anomalous Hall Effect in Silicene
- Electronic structure of silicon-based nanostructures
- Anisotropic behaviors of massless Dirac fermions in graphene under periodic potential
- Weak localisation in graphene flakes
- Friedel oscillations, impurity scattering and temperature dependence of resistivity in graphene
- Spontaneous Symmetry Breaking and Dynamic Phase Transition in Monolayer Silicene
- Quasiparticle Chirality in Epitaxial Graphene Probed at the Nanometer Scale
- Does Silicene on Ag(111) Have a Dirac Cone?
- Effect of a single impurity on the local density of states in monolayer and bilayer graphene
- Power laws in surface state LDOS oscillations near a step edge