Possible charge ordering and anomalous transport in graphene/graphene quantum dot heterostructure
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Possible charge ordering and anomalous transport in graphene/graphene quantum dot heterostructureAutor(es)
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2024Cita bibliográfica
Roy, R., Holec, D., Michal, L., Hemzal, D., Sarkar, S., Sandeep Kumar, G., Nečas, D., Dhankhar, M., Kaushik, P., Jénnifer Gómez, & Zajíčková, L. (2024). Possible charge ordering and anomalous transport in graphene/graphene quantum dot heterostructure. Journal of Physics Condensed Matter, 36(26). https://doi.org/10.1088/1361-648X/AD31BF
Resumo
[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 (T1 ∼ 213K, T2 ∼ 325K) 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 ∼ 0.05 eV above the Fermi level (ab initio simulations) and carrier density n ∼ −0.3 × 1012 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) ramework. Our results provide impetus to investigate strongly correlated phenomena such as CDW and superconducting phase transitions in novel graphene based heterostructures.
Palabras chave
Graphene
Graphene quantum dots
Heterostructure
Charge ordering
Raman spectroscopy
Low temperature transport
Ab initio simulation
Graphene quantum dots
Heterostructure
Charge ordering
Raman spectroscopy
Low temperature transport
Ab initio simulation
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Creative Commons Attribution 4.0 licence