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We report the first experimental study upon the optical trapping andmanipulation of topological insulator (TI) particles. By virtue of the uniqueTI properties, which have a conducting surface and an insulating bulk, theparticles present a peculiar behaviour in the presence of a single laser beamoptical tweezers: they oscillate in a plane perpendicular to the direction ofthe laser propagation, as a result of the competition between radiationpressure and gradient forces. In other words, TI particles behave as opticallyinduced oscillators, allowing dynamical measurements with unprecedentedsimplicity and purely optical control. Actually, optical rheology of softmatter interfaces and biological membranes, as well as dynamical forcemeasurements in macromolecules and biopolymers, may be quoted as feasiblepossibilities for the near future.

Topological insulator particles as optically induced oscillators: towards dynamical force measurements and optical rheology