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JR

John R. Wallbank

UK Centre for Ecology & Hydrology

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Vladimir I. Fal’ko

Henry Royce Institute

Marcin Mucha‐Kruczyński

University of Bath

Kenji Watanabe

National Institute for Materials Science

Takashi Taniguchi

National Institute for Materials Science

Rosanna Lane

UK Centre for Ecology & Hydrology

Thomas Chitson

UK Centre for Ecology & Hydrology

Simon Parry

UK Centre for Ecology & Hydrology

Stephen Turner

UK Centre for Ecology & Hydrology

Katie Facer-Childs

UK Centre for Ecology & Hydrology

Alison L. Kay

UK Centre for Ecology & Hydrology

Cooperative Institutions

University of Manchester

Henry Royce Institute

UK Centre for Ecology & Hydrology

ETH Zurich

Lancaster University

Chinese Academy of Sciences

National Institute for Materials Science

University of Chinese Academy of Sciences

Centre National de la Recherche Scientifique

Institute of Physics

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Imputation of missing sub-hourly precipitation data in a large sensor network: A machine learning approach

Journal of Hydrology (2020)

Benedict D. Chivers John R. Wallbank Steven J. Cole Ondřej Šebek Simon Stanley

Imputation (statistics)

10.1016/j.jhydrol.2020.125126

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Citations (30)

Springer theses (2014)

John R. Wallbank

10.1007/978-3-319-07722-2_9

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Citations (0)

Springer theses (2014)

John R. Wallbank

Moiré pattern

Lattice (music)

10.1007/978-3-319-07722-2_1

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Supplementary material to "eFLaG: enhanced future FLows and Groundwater. A national dataset of hydrological projections based on UKCP18"

Jamie Hannaford Jonathan D. Mackay Matthew Ascott Victoria A. Bell Thomas Chitson

10.5194/essd-2022-40-supplement

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Citations (1)

Supplementary material to "Divergent future drought projections in UK river flows and groundwater levels"

Simon Parry Jonathan D. Mackay Thomas Chitson Jamie Hannaford Victoria A. Bell

10.5194/hess-2023-59-supplement

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Transport experiments in twisted (double) bilayer graphene

Bulletin of the American Physical Society (2020)

Peter Rickhaus F. de Vries Elías Portolés Giulia Zheng Ming‐Hao Liu

Bilayer graphene

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Moiré superlattice effects in graphene/boron‐nitride van der Waals heterostructures

Annalen der Physik (2015)

John R. Wallbank Marcin Mucha‐Kruczyński Xi Chen Vladimir I. Fal’ko

Van der Waals heterostructures of graphene and hexagonal boron nitride feature a moiré superlattice for graphene's Dirac electrons. Here, we review the effects generated by this superlattice, including a specific miniband structure featuring gaps and secondary Dirac points, and a fractal spectrum of magnetic minibands known as Hofstadter's butterfly. image

Moiré pattern

Hexagonal boron nitride

10.1002/andp.201400204

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Cloning of Dirac fermions in graphene superlattices

Л. А. Пономаренко Р. В. Горбачев Geliang Yu D. C. Elias R. Jalil

Landau quantization

10.1038/nature12187

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Transport Through a Network of Topological Channels in Twisted Bilayer Graphene

Nano Letters (2018)

Peter Rickhaus John R. Wallbank Sergey Slizovskiy Riccardo Pisoni Hiske Overweg

We explore a network of electronic quantum valley Hall (QVH) states in the moir\'e crystal of minimally twisted bilayer graphene. In our transport measurements we observe Fabry-P\'erot and Aharanov-Bohm oscillations which are robust in magnetic fields ranging from 0 to 8T, in strong contrast to more conventional 2D systems where trajectories in the bulk are bent by the Lorentz force. This persistence in magnetic field and the linear spacing in density indicate that charge carriers in the bulk flow in topologically protected, one dimensional channels. With this work we demonstrate coherent electronic transport in a lattice of topologically protected states.

Bilayer graphene

Lorentz force

Lattice (music)

Topological insulator

10.1021/acs.nanolett.8b02387

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Dirac edges of fractal magnetic minibands in graphene with hexagonal moiré superlattices

Physical Review B (2014)

Xi Chen John R. Wallbank Aavishkar A. Patel Marcin Mucha‐Kruczyński Edward McCann

We find a systematic reappearance of massive Dirac features at the edges of consecutive minibands formed at magnetic fields ${B}_{p/q}=\frac{p}{q}{\ensuremath{\phi}}_{0}/S$ providing rational magnetic flux through a unit cell of the moir\'e superlattice created by a hexagonal substrate for electrons in graphene. The Dirac-type features in the minibands at $B={B}_{p/q}$ determine a hierarchy of gaps in the surrounding fractal spectrum and show that these minibands have topological insulator properties. Using the additional $q$-fold degeneracy of magnetic minibands at ${B}_{p/q}$, we trace the hierarchy of the gaps to their manifestation in the form of incompressible states upon variation of the carrier density and magnetic field.

10.1103/physrevb.89.075401

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Citations (45)

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