Temperature-dependent electron-electron interaction in graphene on SrTiO3
- Temperature-dependent electron-electron interaction in graphene on SrTiO3
- 류혜진; Jinwoong Hwang; Debin Wang; Jonathan Denlinger; Yuegang Zhang; Juyeon Yi; Sung-Kwan Mo; Choongyu Hwang; Alessandra Lanzara
- Issue Date
- Nano letters
- VOL 17, 5914
- The electron band structure of graphene on SrTiO3 substrate 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 SrTiO3 are 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 SrTiO3 can 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.
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