Possible charge ordering and anomalous transport in graphene/graphene quantum dot heterostructure
Use este enlace para citar
http://hdl.handle.net/2183/38588
Excepto si se señala otra cosa, la licencia del ítem se describe como Creative Commons Attribution 4.0 licence
Colecciones
Metadatos
Mostrar el registro completo del ítemTítulo
Possible charge ordering and anomalous transport in graphene/graphene quantum dot heterostructureAutor(es)
Fecha
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
Resumen
[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 clave
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
Versión del editor
Derechos
Creative Commons Attribution 4.0 licence