Temperature-Dependent Electron-Electron Interaction in Graphene on SrTiO3
- Author(s): Ryu, H
- Hwang, J
- Wang, D
- Disa, AS
- Denlinger, J
- Zhang, Y
- Mo, SK
- Hwang, C
- Lanzara, A
- et al.
Published Web Location
https://doi.org/10.1021/acs.nanolett.7b01650Abstract
© 2017 American Chemical Society. The electron band structure of graphene on SrTiO3substrate has been investigated as a function of temperature. The high-resolution angle-resolved photoemission study reveals that the spectral width at Fermi energy and the Fermi velocity of graphene on SrTiO3are comparable to those of graphene on a BN substrate. Near the charge neutrality, the energy-momentum dispersion of graphene exhibits a strong deviation from the well-known linearity, which is magnified as temperature decreases. Such modification resembles the characteristics of enhanced electron-electron interaction. Our results not only suggest that SrTiO3can be a plausible candidate as a substrate material for applications in graphene-based electronics but also provide a possible route toward the realization of a new type of strongly correlated electron phases in the prototypical two-dimensional system via the manipulation of temperature and a proper choice of dielectric substrates.