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ROY, R. HOLEC, D. MICHAL, L. HEMZAL, D. SARKAR, S. KUMAR, G. NEČAS, D. DHANKHAR, M. KAUSHIK, P. GOMEZ PEREZ, I. ZAJÍČKOVÁ, L.
Original Title
Possible charge ordering and anomalous transport in graphene/graphene quantum dot heterostructure
Type
journal article in Web of Science
Language
English
Original 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.
Keywords
graphene; graphene quantum dots; heterostructure; charge ordering; Raman spectroscopy; low temperature transport; ab initio simulation
Authors
ROY, R.; HOLEC, D.; MICHAL, L.; HEMZAL, D.; SARKAR, S.; KUMAR, G.; NEČAS, D.; DHANKHAR, M.; KAUSHIK, P.; GOMEZ PEREZ, I.; ZAJÍČKOVÁ, L.
Released
3. 6. 2024
Publisher
IOP Publishing Ltd
Location
BRISTOL
ISBN
1361-648X
Periodical
Journal of Physics Condensed Matter
Year of study
36
Number
26
State
United Kingdom of Great Britain and Northern Ireland
Pages from
265601
Pages to
265612
Pages count
12
URL
https://iopscience.iop.org/article/10.1088/1361-648X/ad31bf
Full text in the Digital Library
http://hdl.handle.net/11012/249532
BibTex
@article{BUT188421, author="Rajarshi {Roy} and David {Holec} and Lukáš {Michal} and Dušan {Hemzal} and Saikat {Sarkar} and Gundam Sandeep {Kumar} and David {Nečas} and Meena {Dhankhar} and Preeti {Kaushik} and Inmaculada Jennifer {Gomez Perez} and Lenka {Zajíčková}", title="Possible charge ordering and anomalous transport in graphene/graphene quantum dot heterostructure", journal="Journal of Physics Condensed Matter", year="2024", volume="36", number="26", pages="12", doi="10.1088/1361-648X/ad31bf", issn="1361-648X", url="https://iopscience.iop.org/article/10.1088/1361-648X/ad31bf" }