Quadrene: A Novel Quasi-2D Carbon Allotrope with High Carrier Mobility

Kleuton A. L. Lima; José A. dos S. Laranjeira; Neymar J. N. Cavalcante; Nicolas F. Martins; Julio R. Sambrano; Douglas S. Galvão; Luiz A. Ribeiro Jr

arXiv · 2512.14911

Quadrene: A Novel Quasi-2D Carbon Allotrope with High Carrier Mobility

Kleuton A. L. Lima·José A. dos S. Laranjeira·Neymar J. N. Cavalcante·Nicolas F. Martins·Julio R. Sambrano·Douglas S. Galvão·Luiz A. Ribeiro Jr

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Abstract

We present a comprehensive first-principles investigation of a novel carbon allotrope characterized by quasi-tetragonal atomic motifs and quasi-two-dimensional structural behavior. Structural analysis reveals an open framework composed of alternating diamond-like and square units, while thermodynamic assessments indicate a negative formation energy, suggesting high intrinsic stability. Phonon spectra confirm dynamical robustness, and \textit{ab initio} molecular dynamics simulations at 1000~K validate its thermal resilience. Furthermore, the system exhibits an indirect bandgap of 1.58 eV at the HSE06 level, anisotropic mechanical behavior, and a broadband optical response, reinforcing its potential for nanoelectronic and optoelectronic applications. The highly anisotropic mechanical behavior is characterized by an in-plane Young's modulus ranging from 80 to 550 GPa, depending on crystallographic direction. Additionally, the electronic transport properties exhibit pronounced anisotropy, with hole mobilities reaching up to 5.83 x 10^6 cm^2/V . s and electron mobilities up to 6.40 x 10^6 cm^2/V . s along different crystallographic directions, highlighting the material's potential for directionally selective nanoelectronic device applications.

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Kleuton A. L. Lima, José A. dos S. Laranjeira, Neymar J. N. Cavalcante, Nicolas F. Martins, Julio R. Sambrano, Douglas S. Galvão, Luiz A. Ribeiro Jr. 2025-12-16. Quadrene: A Novel Quasi-2D Carbon Allotrope with High Carrier Mobility. https://arxiv.org/abs/2512.14911

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