A Possible 140k Charge Density Wave Transition in Bi2se3

Li, Yanan; Parsons, Christian; Ramakrishna, Sanath K.; Dwivedi, Anand; Schofield, M. A.; Reyes, A. P.; Guptasarma, P.

doi:10.2139/ssrn.4465370

Cited by 1 publication

(1 citation statement)

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“…Hence, an unconventional second order phase transition is more plausible related to − → q dependent EPC [55]. Moreover, CDW in topological insulator (TI) Bi 2 Se 3 [56], has shown that both the first order and the second order phase transitions can be possible in the same material. It is known that, strong electronelectron interactions (EEI) can trigger multiple charge ordering states as well [57][58][59].…”

Section: Low-temperature Electrical Transportmentioning

confidence: 99%

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

Roy,

Holec,

Michal

et al. 2024

J. Phys.: Condens. Matter

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Observations of superconductivity and charge density waves (CDW) in graphene have been elu sive 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 × 1012cm−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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