High-mobility transport in isotopically enriched ¹²C and ¹³C exfoliated graphene
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 ¹²C and ¹³C grown by a high-pressure-high-temperature method to exfoliate graphene layers. We fabricated Hall bar devices and performed quantum transport measurements, revealing mobilities exceeding 10⁵ cm² /V s 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. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000647669Publication status
publishedExternal links
Journal / series
Physical Review ResearchVolume
Pages / Article No.
Publisher
American Physical SocietyOrganisational unit
03512 - Günther, Detlef / Günther, Detlef
02891 - ScopeM / ScopeM
03439 - Ensslin, Klaus / Ensslin, Klaus
08835 - Ihn, Thomas (Tit.-Prof.)
02205 - FIRST-Lab / FIRST Center for Micro- and Nanoscience
Funding
951541 - Entropy in engineered quantum systems — Mesoscopic thermodynamics of correlated quantum states (EC)
862660 - Toward new era of quantum electrical measurements through phase slips (EC)
185902 - QSIT - Quantum Science and Technology (SNF)
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