Possible charge ordering and anomalous transport in graphene/graphene quantum dot heterostructure
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Date
2024-06-03
Authors
Roy, Rajarshi
Holec, David
Michal, Lukáš
Hemzal, Dušan
Sarkar, Saikat
Kumar, Gundam Sandeep
Nečas, David
Dhankhar, Meena
Kaushik, Preeti
Gomez Perez, Inmaculada Jennifer
0000-0001-7731-8453Advisor
Referee
Mark
Journal Title
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Volume Title
Publisher
IOP Publishing Ltd
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Abstract
Observations of superconductivity and charge density waves (CDW) in graphene have been elusive thus far due to weak electron-phonon coupling (EPC) interactions. Here, we report a unique observation of anomalous transport and multiple charge ordering phases at high temperatures ( T 1 similar to 213 K , T 2 similar to 325 K ) in a 0D-2D van der Waals (vdW) heterostructure comprising of single layer graphene (SLG) and functionalized (amine) graphene quantum dots (GQD). The presence of functionalized GQD contributed to charge transfer with shifting of the Dirac point similar to 0.05 eV above the Fermi level (ab initio simulations) and carrier density n similar to - 0.3 x 10 12 cm - 2 confirming p-doping in SLG and two-fold increase in EPC interaction was achieved. Moreover, we elucidate the interplay between electron-electron and electron-phonon interactions to substantiate high temperature EPC driven charge ordering in the heterostructure through analyses of magnetotransport and weak anti-localization (WAL) framework. Our results provide impetus to investigate strongly correlated phenomena such as CDW and superconducting phase transitions in novel graphene based heterostructures.
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Citation
Journal of Physics Condensed Matter. 2024, vol. 36, issue 26, p. 265601-.
https://iopscience.iop.org/article/10.1088/1361-648X/ad31bf
https://iopscience.iop.org/article/10.1088/1361-648X/ad31bf
Document type
Peer-reviewed
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en