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Composite super-moir\'e lattices in double aligned graphene heterostructures

Publikováno v: Science Advances 20 Dec 2019: Vol. 5, no. 12, eaay8897

When two-dimensional atomic crystals are brought into close proximity to form a van der Waals heterostructure, neighbouring crystals can start influencing each others electronic properties. Of particular interest is the situation when the periodicity

Externí odkaz: http://arxiv.org/abs/1912.12268

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Enhanced superconductivity in few-layer TaS$_2$ due to healing by oxygenation

Autor: Bekaert, J., Khestanova, E., Hopkinson, D. G., Birkbeck, J., Clark, N., Zhu, M., Bandurin, D. A., Gorbachev, R., Fairclough, S., Zou, Y., Hamer, M., Terry, D. J., Peters, J. J. P., Sanchez, A. M., Partoens, B., Haigh, S. J., Milošević, M. V., Grigorieva, I. V.

When approaching the atomically thin limit, defects and disorder play an increasingly important role in the properties of two-dimensional materials. Superconductivity is generally thought to be vulnerable to these effects, but here we demonstrate the

Externí odkaz: http://arxiv.org/abs/1912.07257

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Strong magnetophonon oscillations in extra-large graphene

Autor: Kumaravadivel, P., Greenaway, M. T., Perello, D., Berdyugin, A., Birkbeck, J., Wengraf, J., Liu, S., Edgar, J. H., Geim, A. K., Eaves, L., Kumar, R. Krishna

Publikováno v: Nature Communications 10, 3334 (2019)

Van der Waals materials and their heterostructures offer a versatile platform for studying a variety of quantum transport phenomena due to their unique crystalline properties and the exceptional ability in tuning their electronic spectrum. However, m

Externí odkaz: http://arxiv.org/abs/1905.00386

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Micromagnetometry of two-dimensional ferromagnets

Autor: Kim, M., Kumaravadivel, P., Birkbeck, J., Kuang, W., Xu, S. G., Hopkinson, D. G., Knolle, J., McClarty, P. A., Berdyugin, A. I., Shalom, M. Ben, Gorbachev, R. V., Haigh, S. J., Liu, S., Edgar, J. H., Novoselov, K. S., Grigorieva, I. V., Geim, A. K.

Publikováno v: Nature Electronics 2, 457 (2019)

The study of atomically thin ferromagnetic crystals has led to the discovery of unusual magnetic behaviour and provided insight into the magnetic properties of bulk materials. However, the experimental techniques that have been used to explore ferrom

Externí odkaz: http://arxiv.org/abs/1902.06988

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Excess resistivity in graphene superlattices caused by umklapp electron-electron scattering

Autor: Wallbank, J. R., Kumar, R. Krishna, Holwill, M., Wang, Z., Auton, G. H., Birkbeck, J., Mishchenko, A., Ponomarenko, L. A., Watanabe, K., Taniguchi, T., Novoselov, K. S., Aleiner, I. L., Geim, A. K., Fal'ko, V. I.

Publikováno v: Nature Physics (2018)

Umklapp processes play a fundamental role as the only intrinsic mechanism that allows electrons to transfer momentum to the crystal lattice and, therefore, provide a finite electrical resistance in pure metals. However, umklapp scattering has proven

Externí odkaz: http://arxiv.org/abs/1808.05592

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Edge currents shunt the insulating bulk in gapped graphene

Autor: Zhu, M. J., Kretinin, A. V., Thompson, M. D., Bandurin, D. A., Hu, S., Yu, G. L., Birkbeck, J., Mishchenko, A., Vera-Marun, I. J., Watanabe, K., Taniguchi, T., Polini, M., Prance, J. R., Novoselov, K. S., Geim, A. K., Shalom, M. Ben

Publikováno v: Nature Communications 8, 14552 (2017)

An energy gap can be opened in the electronic spectrum of graphene by lifting its sublattice symmetry. In bilayers, it is possible to open gaps as large as 0.2 eV. However, these gaps rarely lead to a highly insulating state expected for such semicon

Externí odkaz: http://arxiv.org/abs/1612.05902

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