142 citations · 515 across the 10 of their papers we have counts for
11 papers
Composite Skyrmion bags in two-dimensional materials
David Foster, Charles Kind, Paul J. Ackerman +3
Skyrmions are particle-like topological excitations, studied in various condensed matter systems and models of high-energy physics (HEP). They occur as stable spin textures in cert…
Tuning and Switching a Plasmonic Quantum Dot Sandwich in a Nematic Line Defect
Haridas Mundoor, Ghadah. H. Sheetah, Sungoh Park +3
We study the quantum-mechanical effects arising in a single semiconductor core/shell quantum dot controllably sandwiched between two plasmonic nanorods. Control over the position a…
Collective behavior of active topological solitons, knotted streamlines, and transport of cargo in liquid crystals
Hayley R. O. Sohn, Paul J. Ackerman, Timothy J. Boyle +3
Active colloids and liquid crystals are capable of locally converting the macroscopically-supplied energy into directional motion and promise a host of new applications, ranging fr…
Liquid crystal Skyrmions can swim
Paul J. Ackerman, Timothy Boyle, Ivan I. Smalyukh
Topologically nontrivial field configurations called "baby skyrmions" behave like particles and give origins to the field of skyrmionics that promises racetrack memory and other te…
Diversity of knot solitons in liquid crystals manifested by linking of preimages in torons and hopfions
P. J. Ackerman, I. I. Smalyukh
Topological solitons are knots in continuous physical fields classified by non-zero Hopf index values. Despite arising in theories that span many branches of physics, from elementa…
Plasmon-Exciton Interactions Probed Using Spatial Coentrapment of Nanoparticles by Topological Singularities
P. J. Ackerman, Haridas Mundoor, I. I. Smalyukh +1
We study plasmon-exciton interaction by using topological singularities to spatially confine, selectively deliver, cotrap and optically probe colloidal semiconductor and plasmonic…
Reversal of Helicoidal Twist Handedness Near Point Defects of Confined Chiral Liquid Crystals
P. J. Ackerman, I. I. Smalyukh
Handedness of the director twist in cholesteric liquid crystals is commonly assumed to be the same throughout the medium, determined solely by the chirality of constituent molecule…
Two-dimensional skyrmions and other solitonic structures in confinement-frustrated chiral nematics
Paul J. Ackerman, Rahul P. Trivedi, Bohdan Senyuk +2
We explore spatially localized solitonic configurations of a director field, generated using optical realignment and laser-induced heating, in frustrated chiral nematic liquid crys…
Shape-dependent oriented trapping and scaffolding of plasmonic nanoparticles by topological defects for self-assembly of colloidal dimers in liquid crystals
Bohdan Senyuk, Julian S. Evans, Paul J. Ackerman +6
We demonstrate scaffolding of plasmonic nanoparticles by topological defects induced by colloidal microspheres to match their surface boundary conditions with a uniform far-field a…
Optically and elastically assembled plasmonic nanoantennae for spatially resolved characterization of chemical composition in soft matter systems using surface enhanced spontaneous and stimulated Raman scattering
Haridas Mundoor, Taewoo Lee, Derek G. Gann +4
We present a method to locally probe spatially varying chemical composition of soft matter systems by use of optically controlled and elastically self-assembled plasmonic nanoanten…
Threading the Needle: Generating Textures in Nematics
Bryan Gin-ge Chen, Paul J. Ackerman, Gareth P. Alexander +2
The Hopf fibration is an example of a texture: a topologically stable, smooth, global configuration of a field. Here we demonstrate the controlled sculpting of the Hopf fibration i…