Engineering molecular aggregate spectra

Abstract

Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. We show that optical properties of linear molecular aggregates undergo drastic changes when aggregates are deposited on a metal surface. The dipole-dipole interactions of monomers with their images can result in strong re-structuring of both the exciton band and the absorption spectrum, depending on the arrangement of the monomer transition dipoles with respect to the surface.

Non-singular screw dislocations as the Coulomb gas with smoothed-out coupling and the renormalization of the shear modulus

“…Since the first attempts [26,27], various approaches to dislocations with non-trivial core are known. For instance, the quasi-continuum approach [28,29], the gradient elasticity [30,31], and the Lagrangian translational gauging [33][34][35][36][37] enable one to obtain appropriate solutions for non-singular screw dislocations.The elastic stresses of the screw dislocation are obtained in [33][34][35][36][37] in the form of the superposition of the conventional far-reaching ("background") contribution and a shortranged ("gauge") correction. The latter modifies the background fields within a compact core.…”

“…Note that the secondorder elasticity is also of importance for the defects in crystals [38]. The approach of [35] is suitable for study of the second order stresses in the case of a non-singular screw dislocation [39].This paper is concerned with a thermodynamical description of a large number of the modified screw dislocations [35] lying within a long enough cylinder of a circular crosssection. The functional integration [40][41][42][43][44][45] is used to represent the partition function and to study certain averages.…”

“…The functional integration [40][41][42][43][44][45] is used to represent the partition function and to study certain averages. The core energies are accounted for in accordance with [35]. It is shown that the collection of parallel non-singular dislocations is equivalent to the two-dimensional Coulomb-like system of charges interacting via the potential which is logarithmic at large distances but vanishes locally (smoothed out coupling).…”

“…Since the first attempts [26,27], various approaches to dislocations with non-trivial core are known. For instance, the quasi-continuum approach [28,29], the gradient elasticity [30,31], and the Lagrangian translational gauging [33][34][35][36][37] enable one to obtain appropriate solutions for non-singular screw dislocations.…”

Effect of surface stresses on elastic behavior of a screw dislocation inside the wall of a nanotube

“…To dispense with these classical difficulties, one can use some of extended theories of elasticity. In this context, different size‐dependent theories of elasticity, such as non‐local 15–18, gradient 19–30, gauge 31–39, and nonlinear 40 theories have been applied to the problem of a screw dislocation in infinite 15, 16, 19, 20, 23–25, 31–37, 40, bounded 27, two‐phase 17, 21, 22, 28, 29, and functionally graded 26 solids. However, practical use of these approaches in the case of systems with several surface/interface boundaries is rather cumbersome and laborious.…”