High mobility transport in isotopically-enriched $^{12}$C and $^{13}$C exfoliated graphene

TL;DR

This study demonstrates high mobility and quantum transport phenomena in isotopically enriched graphene, providing a promising platform for quantum computing applications with enhanced coherence properties.

Contribution

It reports the fabrication and characterization of high-mobility graphene from isotopically enriched $^{12}$C and $^{13}$C crystals, highlighting their potential for quantum qubit development.

Findings

Mobility exceeding 10^5 cm^2/Vs in isotopically enriched graphene

Observation of quantum Hall effect up to filling factor one

Detection of Brown-Zak oscillations indicating high-quality material

Abstract

Graphene quantum dots are promising candidates for qubits due to weak spin-orbit and hyperfine interactions. The hyperfine interaction, controllable via isotopic purification, could be the key to further improving the coherence. Here, we use isotopically enriched graphite crystals of both $^{12}$C and $^{13}$C grown by high-pressure-high-temperature method to exfoliate graphene layers. We fabricated Hall bar devices and performed quantum transport measurements, revealing mobilities exceeding $10^{5}$$\textrm{cm}^{2}/Vs$ and a long mean free path of microns, which are as high as natural graphene. Shubnikov-de Haas oscillations, quantum Hall effect up to the filling factor of one, and Brown-Zak oscillations due to the alignment of hBN and graphene are observed thanks to the high mobility. These results constitute a material platform for physics and engineering of isotopically-enriched graphene qubits.