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Dimensional reduction, quantum Hall effect and layer parity in graphite films
Jun Yin, Sergey Slizovskiy, Yang Cao +13
The quantum Hall effect (QHE) originates from discrete Landau levels forming in a two-dimensional (2D) electron system in a magnetic field. In three dimensions (3D), the QHE is for…
Tunnel spectroscopy of localised electronic states in hexagonal boron nitride
M. T. Greenaway, E. E. Vdovin, D. Ghazaryan +17
Hexagonal boron nitride (hBN) is a large band gap layered crystal, frequently incorporated in van der Waals (vdW) heterostructures as an insulating or tunnel barrier. Localised sta…
Excess resistivity in graphene superlattices caused by umklapp electron-electron scattering
J. R. Wallbank, R. Krishna Kumar, M. Holwill +11
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 electri…
High-order fractal states in graphene superlattices
R. Krishna Kumar, A. Mishchenko, X. Chen +7
Graphene superlattices were shown to exhibit high-temperature quantum oscillations due to periodic emergence of delocalized Bloch states in high magnetic fields such that unit frac…
Unusual suppression of the superconducting energy gap and critical temperature in atomically thin NbSe2
Ekaterina Khestanova, John Birkbeck, Mengjian Zhu +12
It is well known that superconductivity in thin films is generally suppressed with decreasing thickness. This suppression is normally governed by either disorder-induced localizati…
Magnon-assisted tunnelling in van der Waals heterostructures based on CrBr3
Davit Ghazaryan, Mark T. Greenaway, Zihao Wang +14
The growing family of two-dimensional (2D) materials that are now available can be used to assemble van der Waals heterostructures with a wide range of properties. Of particular in…