Isotropic charge screening of the anisotropic black phosphorus revealed by potassium adatoms

Abstract

Black phosphorus has attracted great research interest due to its numerous applications in electronic devices, optoelectronic devices, energy storages and so on. Compared with the majority of two-dimensional materials, black phosphorus possesses a unique property, i.e. the strong in-plane anisotropy. All the properties reported so far, including its effective mass, electron mobility, light absorption, thermal conductivity and so on, have shown great anisotropy in the basal plane. This property renders black phosphorus unique applications not achievable with other two-dimensional materials. In this work, however, we discover a remarkable isotropic behavior in the strongly anisotropic black phosphorus, i.e. its electrostatic screening of point charges. We use the tip-induced band bending of a scanning tunneling microscope to map out the Coulomb field of ionized potassium adatoms on black phosphorus, and reveal its isotropic charge screening. This discovery is important for understanding electron scattering and transport in black phosphorus.

arXiv comment18 pages, 4 figures

References in corpus (24)

• Black phosphorus field-effect transistors
• Phosphorene: A New 2D Material with High Carrier Mobility
• High-mobility transport anisotropy and linear dichroism in few-layer black phosphorus
• Rediscovering Black Phosphorus: A Unique Anisotropic 2D Material for Optoelectronics and Electronics
• Isolation and characterization of few-layer black phosphorus
• The Renaissance of Black Phosphorus
• Electric field effect in ultrathin black phosphorus
• Observation of tunable bandgap and anisotropic Dirac semimetal state in black phosphorus
• Direct Observation of Layer-Dependent Electronic Structure in Phosphorene
• Black phosphorus: narrow gap, wide applications
• Anisotropic in-plane thermal conductivity observed in few-layer black phosphorus
• Plasmons and screening in monolayer and multilayer black phosphorus
• Device Perspective for Black Phosphorus Field-Effect Transistors: Contact Resistance, Ambipolar and Scaling
• Esaki diodes in van der Waals heterojunctions with broken-gap energy band alignment
• Stability Diagram of a Few-Electron Triple Dot
• Gate-Controlled Ionization and Screening of Cobalt Adatoms on a Graphene Surface
• Strong Thermal Transport Anisotropy and Strain Modulation in Single-Layer Phosphorene
• Anisotropic Thermal Conductivity of Exfoliated Black Phosphorus
• Enhanced piezoelectricity and modified dielectric screening of 2-D group-IV monochalcogenides
• Mapping Dirac Quasiparticles near a Single Coulomb Impurity on Graphene
• Native point defects in few-layer phosphorene
• Probing Single Vacancies in Black Phosphorus at the Atomic Level
• Coulomb interactions and screening effects in few-layer black phosphorus: a tight-binding consideration beyond the long-wavelength limit
• On the Connection of Anisotropic Conductivity to Tip Induced Space Charge Layers in Scanning Tunneling Spectroscopy of p-doped GaAs

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