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Temperature-Dependent Electron-Electron Interaction in Graphene on SrTiO3.

Hyejin Ryu1,2, Jinwoong Hwang3, Debin Wang4

  • 1Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.

Nano Letters
|September 15, 2017
PubMed
Summary

Investigating graphene on strontium titanate (SrTiO3) substrates reveals temperature-dependent electron band structure. Decreasing temperature enhances electron-electron interactions, impacting graphene

Keywords:
ARPESGrapheneSrTiO3electronic correlationinterface

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Graphene's unique electronic properties make it promising for next-generation electronics.
  • Understanding substrate interactions is crucial for tailoring graphene's performance.
  • Strontium titanate (SrTiO3) is a dielectric material with potential as a graphene substrate.

Purpose of the Study:

  • To investigate the electron band structure of graphene on a SrTiO3 substrate.
  • To explore the influence of temperature on graphene's electronic properties when supported by SrTiO3.
  • To assess SrTiO3 as a substrate for graphene-based electronic applications.

Main Methods:

  • High-resolution angle-resolved photoemission spectroscopy (ARPES).
  • Variable temperature measurements of graphene on SrTiO3.
  • Analysis of spectral width at Fermi energy and Fermi velocity.

Main Results:

  • Graphene on SrTiO3 exhibits spectral width and Fermi velocity comparable to graphene on hexagonal boron nitride (BN).
  • A significant deviation from linear energy-momentum dispersion near charge neutrality was observed.
  • This deviation intensified with decreasing temperature, indicating enhanced electron-electron interactions.

Conclusions:

  • SrTiO3 is a viable substrate material for graphene-based electronics.
  • Temperature manipulation and substrate choice can lead to strongly correlated electron phases in graphene.
  • The findings open avenues for novel two-dimensional electronic systems.