Publication result detail

Possible charge ordering and anomalous transport in graphene/graphene quantum dot heterostructure

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

English Title

Possible charge ordering and anomalous transport in graphene/graphene quantum dot heterostructure

Type

WoS Article

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.

English 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

Key words in English

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.

RIV year

2025

Released

03.06.2024

Publisher

IOP Publishing Ltd

Location

BRISTOL

ISBN

1361-648X

Periodical

JOURNAL OF PHYSICS-CONDENSED MATTER

Volume

36

Number

26

State

United Kingdom of Great Britain and Northern Ireland

Pages from

265601

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="0953-8984",
  url="https://iopscience.iop.org/article/10.1088/1361-648X/ad31bf"
}

Documents

s00190-024-01854-1