1. Temperature-Dependent Electron-Electron Interaction in Graphene on SrTiO3
- Author
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Ryu, Hyejin, Hwang, Jinwoong, Wang, Debin, Disa, Ankit S., Denlinger, Jonathan, Zhang, Yuegang, Mo, Sung-Kwan, Hwang, Choongyu, and Lanzara, Alessandra
- Subjects
Condensed Matter - Materials Science - Abstract
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 towards 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., Comment: 16 pages, 3 figures
- Published
- 2017
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