Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 2: Nanotubes, Nanoribbons and Graphene

TT 2.9: Vortrag

Montag, 5. September 2022, 11:45–12:00, H22

Measuring correlated phases in encapsulated bilayer graphene via graphite contacts — •Isabell Weimer, Anna Seiler, and Thomas Weitz — 1st Physical Institute, Faculty of Physics, University of Göttingen, Friedrich-Hund-Platz 1, Göttingen 37077, Germany

Encapsulation of graphene in hexagonal Boron Nitride (hBN) as well as the addition of graphite top and bottom gates to the sample have been central to a lot of the research done on graphene in the recent years. This has allowed the observation of multiple new correlated phases including Stoner metals [1-3], correlated insulators [1] and superconductivity [2] at large electric fields in trigonal warped bilayer graphene.

The extent to which the phase space of Bernal bilayer graphene can be even further explored is amongst other parameters limited by the maximum electric field and thus by the maximum values of gate voltages that can be applied to the sample without breaking through the dielectric. With the aim of increasing these maximum voltages, we have explored the method of using graphite contacts to contact bilayer graphene flakes within van-der-Waals heterostructures [1]. Using graphite contacts instead of commonly used 1D edge contacts [4] removes the necessity to etch into the hBN flakes, which had previously been a limiting factor for the applied electric fields.

[1] A. M. Seiler et al., arXiv:2111.06413 (2021)

[2] H.Zhou et al., Science 375, 774 (2022)

[3] S. C. de la Barrera et al., arXiv:2110.13907 (2021)

[4] L.Wang et al., Science 342, 614 (2013)