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Alexander Croy: Nanomechanics and strain-engineering of phosphorene

posted 5 Jun 2017, 15:25 by info admin   [ updated 5 Jun 2017, 15:31 ]
Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden

One of the many features of atomically thin materials is the possibility to engineer their properties using deformations. Semiconducting materials, like phosphorene, are of particular interest due to their potential for optoelectronic applications. The theoretical description of the electromechanical behaviour requires a consistent
treatment of electronics and mechanics. In this spirit, a multi-scale approach is presented, which combines a recently developed valence-force model [1] - relating macroscopic strain to microscopic displacements of atoms [2] - and a tight-binding model with distancedependent hopping parameters to obtain strain-induced electronic properties. The resulting self-consistent electromechanical model is suitable for large-scale modelling of phosphorene devices. We demonstrate this for the case of an inhomogeneously deformed phosphorene drum, which may be used as an exciton funnel [3]. 

[1] D. Midtvedt and A. Croy, Phys. Chem. Chem. Phys. 18, 23312 (2016).
[2] D. Midtvedt, C. H. Lewenkopf, and A. Croy, 2D Materials 3, 011005 (2016).
[3] P. San-Jose et al, Phys. Rev. X 6, 031046 (2016).

Alexander is currently working as a senior researcher at the chair of Prof. Cuniberti (TU Dresden). His main interests are (computational) nanomechanics of 2d materials and timedependent electron and phonon transport. For his PhD on time-dependent nano electronics he joined the Max Planck Institute for the Physics of Complex Systems (MPIPKS) in Dresden. Later, working with Prof. J. Kinaret and Prof. A. Isacsson (Chalmers, Sweden), the focus of his research shifted to (carbon-based) nanoelectromechanical systems. From 2014-2016 he was Distinguished PKS Postdoctoral Fellow at the MPIPKS.