Emergence of Two-Dimensional Massless Dirac Fermions, Chiral Pseudospins, and Berry's Phase in Potassium Doped Few-Layer Black Phosphorus

Abstract

Thin flakes of black phosphorus (BP) are a two-dimensional (2D) semiconductor whose energy gap is predicted being sensitive to the number of layers and external perturbations. Very recently, it was found that a simple method of potassium (K) doping on the surface of BP closes its band gap completely, producing a Dirac semimetal state with a linear band dispersion in the armchair direction and a quadratic one in the zigzag direction. Here, based on first-principles density functional calculations, we predict that, beyond the critical K density of the gap closure, 2D massless Dirac Fermions (i.e., Dirac cones) emerge in K-doped few-layer BP, with linear band dispersions in all momentum directions, and the electronic states around Dirac points have chiral pseudospins and Berry's phase. These features are robust with respect to the spin-orbit interaction and may lead to graphene-like electronic transport properties with greater flexibility for potential device applications.

References in corpus (10)

• The electronic properties of graphene
• Chiral tunneling and the Klein paradox in graphene
• Chaotic Dirac billiard in graphene quantum dots
• Strain engineered direct-indirect band gap transition and its mechanism in 2D phosphorene
• Observation of tunable bandgap and anisotropic Dirac semimetal state in black phosphorus
• Quasiparticle band structure and tight-binding model for single- and bilayer black phosphorus
• Phosphorene nanoribbons, nanotubes and van der Waals multilayers
• Electric Field Induced Topological Phase Transition in Two-Dimensional Few-layer Black Phosphorus
• Topological Protected Dirac Cones in Compressed Bulk Black Phosphorus
• Role of d orbitals in the Rashba-type spin splitting for noble-metal surfaces

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