Matthew Roberts

Jan 19, 2024 | link.aps.org | Matthew Roberts |Toby Wiseman |Blackett Laboratory

We consider the nearest-neighbor lattice tight-binding model of graphene with slowly spatially varying hopping functions. We develop a systematic low-energy approximation as a derivative expansion in a Dirac spinor field that is perturbative in the strength of the hopping function deformation. The well-known leading description in both the derivative and perturbative expansions is the Dirac equation in flat 2+1-dimensional spacetime with magnetic (strain-)gauge field.

Oct 31, 2023 | steptoe-johnson.com | Matthew Roberts

The National Labor Relations Board (NLRB or the Board) has issued a final rule on its new standard for finding that two entities are a joint employer. The rule focuses on whether the alleged joint employer has the authority to control one or more essential terms of employment. The Board’s prior rule, issued in 2020, required joint employers to not only possess but also exercise substantial direct and immediate control.

Jul 31, 2023 | cuaj.ca | Matthew Roberts

License You, the Author(s), assign your copyright in and to the Article to the Canadian Urological Association.

Apr 4, 2023 | cuaj.ca | Matthew Roberts

License You, the Author(s), assign your copyright in and to the Article to the Canadian Urological Association.