= Holger Stark
{c}
{tag=Physicist}
A theoretical <physicist> who studied how a spherical particle distorts a <nematic liquid crystal>. Minimizing the elastic <free energy> with surface and <magnetic field> terms revealed competing defect configurations, including a surrounding ring. Changing particle size, surface alignment strength or applied <magnetic field> can change the preferred structure, connecting microscopic boundary conditions with observable colloidal organization.<Director field configurations around a spherical particle in a nematic liquid crystal by Holger Stark>[Abstract: competing configurations, energy minimization and field-induced transitions]{ref}
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