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Electric-Field Control in Phosphorene-Based Heterostructures.

Calin-Andrei Pantis-Simut1,2,3, Amanda Teodora Preda1,2,3, Nicolae Filipoiu1,2

  • 1Horia Hulubei National Institute for Physics and Nuclear Engineering, 077126 Magurele-Ilfov, Romania.

Nanomaterials (Basel, Switzerland)
|October 27, 2022
PubMed
Summary
This summary is machine-generated.

Substrate interactions, particularly with hexagonal boron nitride (hBN), significantly enhance band-gap modulation in phosphorene nanoribbons (PNRs). This research also demonstrates achieving measurable spin polarization in PNRs using embedded graphene nanoribbons.

Keywords:
electric-field controlgraphenehexagonal boron nitridenanoribbonphosphorene

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Phosphorene offers unique electronic properties due to its intermediate band gap, making it promising for nanoelectronics.
  • Modulating the band gap of freestanding phosphorene nanoribbons (PNRs) requires high electric fields, posing a challenge for device applications.

Purpose of the Study:

  • To investigate substrate effects on electric-field control of PNR band gaps.
  • To explore methods for contacting PNRs and achieving spin polarization.

Main Methods:

  • Density Functional Theory-Non-Equilibrium Green's Functions (DFT-NEGF) framework.
  • Simulations of PNRs supported by hexagonal boron nitride (hBN) layers.
  • Integration of graphene nanoribbons for electrical contacting.

Main Results:

  • Substrate interaction with hBN substantially enhances PNR band-gap modulation by external gates.
  • Embedding graphene nanoribbons within the hBN substrate enables effective electrical contacting.
  • Anti-ferromagnetic coupling between graphene nanoribbon edges induces measurable spin polarization in the PNR system.

Conclusions:

  • Supporting substrates like hBN are crucial for efficient electric-field control of phosphorene nanoribbon electronic properties.
  • The proposed device architecture facilitates practical applications of PNRs in spintronics and nanoelectronic devices.