Temperature-Dependent Electron–Electron Interaction in Graphene on SrTiO3

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...

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Bibliographic Details
Published in:Nano letters 2017-10, Vol.17 (10), p.5914-5918
Main Authors: Ryu, Hyejin, Hwang, Jinwoong, Wang, Debin, Disa, Ankit S, Denlinger, Jonathan, Zhang, Yuegang, Mo, Sung-Kwan, Hwang, Choongyu, Lanzara, Alessandra
Format: Article
Language:English
Subjects:
ARPES
electronic correlation
Graphene
interface
MATERIALS SCIENCE
SrTiO3
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Summary: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.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.7b01650