222 citations · 834 across the 21 of their papers we have counts for
8 papers · 1 filter
Multi-scale approach for strain-engineering of phosphorene
Daniel Midtvedt, Caio H. Lewenkopf, Alexander Croy
A multi-scale approach for the theoretical description of deformed phosphorene is presented. This approach combines a valence-force model to relate macroscopic strain to microscopi…
Valence force model and nanomechanics of single-layer phosphorene
Daniel Midtvedt, Alexander Croy
In order to understand the relation of strain and material properties, both a microscopic model connecting a given strain to the displacement of atoms, and a macroscopic model rela…
Strain-displacement relations and strain engineering in 2d materials
Daniel Midtvedt, Caio H. Lewenkopf, Alexander Croy
We investigate the electromechanical coupling in 2d materials. For non-Bravais lattices, we find important corrections to the standard macroscopic strain - microscopic atomic-displ…
Strain-tuning of vacancy-induced magnetism in graphene nanoribbons
Daniel Midtvedt, Alexander Croy
Vacancies in graphene lead to the appearance of localized electronic states with non-vanishing spin moments. Using a mean-field Hubbard model and an effective double-quantum dot de…
Nonlinear phononics using atomically thin membranes
Daniel Midtvedt, Andreas Isacsson, Alexander Croy
Phononic crystals and acoustic meta-materials are used to tailor phonon and sound propagation properties by facilitating artificial, periodic structures. Analogous to photonic crys…
FPU physics with nanomechanical graphene resonators: intrinsic relaxation and thermalization from flexural mode coupling
Daniel Midtvedt, Zenan Qi, Alexander Croy +2
Thermalization in nonlinear systems is a central concept in statistical mechanics and has been extensively studied theoretically since the seminal work of Fermi, Pasta and Ulam (FP…
Frequency tuning, nonlinearities and mode coupling in circular graphene resonators
A. M. Eriksson, D. Midtvedt, A. Croy +1
We study circular nanomechanical graphene resonators by means of continuum elasticity theory, treating them as membranes. We derive dynamic equations for the flexural mode amplitud…
Nonlinear Damping in Graphene Resonators
Alexander Croy, Daniel Midtvedt, Andreas Isacsson +1
Based on a continuum mechanical model for single-layer graphene we propose and analyze a microscopic mechanism for dissipation in nanoelectromechanical graphene resonators. We find…