Inducing and controlling rotation on small objects using photonic topological materials

Abstract

Photonic topological insulator plates violate Lorentz reciprocity which leads to a directionality of surface-guided modes. This in-plane directionality can be imprinted via an applied magnetic field. On the basis of macroscopic quantum electrodynamics in nonreciprocal media, we show that two photonic topological insulator surfaces are subject to a tuneable, magnetic-field dependent Casimir torque. Due to the directionality, this torque exhibits a unique $2\pi$ periodicity, in contradistinction to the Casimir torques encountered for reciprocal uniaxial birefringent media or corrugated surfaces which are $\pi$-periodic. Remarkably, the torque direction and strength can be externally driven in situ by simply applying a magnetic field on the system, and we show that this can be exploited to induce a control the rotation of small objects. Our predictions can be relevant for nano-opto-mechanical experiments and devices.

arXiv comment5 pages, 4 figures

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Cited by in corpus (5)

• Giant Casimir torque between rotated gratings and the $\theta =0$ anomaly
• Equilibrium forces on non-reciprocal materials
• Spontaneous Symmetry Breaking of Time-Reversal-Symmetry and Time-Crystal States in Chiral Atomic Systems
• Effect of excess charge carriers and fluid medium on the magnitude and the sign of the Casimir-Lifshitz torque
• Spontaneous Rotational Symmetry Breaking in a Kramers Two-Level System