Topological origin of quasi-flat edge band in phosphorene

2014/04/23 by Motohiko Ezawa · 273 citations
Materials Science · Physics and Astronomy · #2D Materials and Applications #Anisotropy #Band gap #Condensed matter physics #Electric field #Electronic band structure #Enhanced Data Rates for GSM Evolution #Field (mathematics) #Geometry #Graphene research and applications #Honeycomb #MXene and MAX Phase Materials #Optics #Perpendicular #Phosphorene #Physics #Quantum mechanics #Ribbon #Topology (electrical circuits) #cond-mat.mes-hall #cond-mat.mtrl-sci

paper · pdf · doi:10.1088/1367-2630/16/11/115004

published in New Journal of Physics 16(11), 115004 (IOP Publishing) · 6 pages, 5 figures

arxiv created 2014/04/23 · openalex publication_date 2014/10/30 · arxiv updated 2014/11/10 · openalex created_date 2020/11/23 · openalex updated_date 2026/08/06

Abstract

Phosphorene, a honeycomb structure of black phosphorus, was isolated recently. The band structure is highly anisotropic, where the k x direction is Dirac-like and the k y direction is Schrödinger-like. A prominent feature is the presence of a quasi-flat edge band entirely detached from the bulk band in phosphorene nanoribbons. We explore the mechanism of the emergence of the quasi-flat band by employing the topological argument invented to explain successfully the flat band familiar in graphene. The quasi-flat band can be controlled by applying in-plane electric field perpendicular to the ribbon direction. The conductance is switched off above a critical electric field, which acts as a field-effect transistor.

Citations

• Layer-controlled band gap and anisotropic excitons in few-layer black phosphorus
• Symmetry-protected quantization and bulk-edge correspondence of massless Dirac fermions: Application to the fermionic Shastry-Sutherland model
• Tight-binding approach to uniaxial strain in graphene
• Zero modes and edge states of the honeycomb lattice
• Peculiar width dependence of the electronic properties of carbon nanoribbons
• Edge effects on the electronic properties of phosphorene nanoribbons
• Spatial distribution of local currents of massless Dirac fermions in quantum transport through graphene nanoribbons
• Valley polarization in MoS2 monolayers by optical pumping
• The electronic properties of graphene
• Valley-selective circular dichroism of monolayer molybdenum disulphide
• Coherent transport in graphene nanoconstrictions

Cited by

• Photoinduced dc Hall current in few-layer black phosphorus with a gate-tunable Floquet gap
• Landau levels of single-layer and bilayer phosphorene