Mechanical rotation via optical pumping of paramagnetic impurities

• Autores: Zangara, Pablo René; Wood, Alexander; Doherty, Marcus W.; Meriles, Carlos A.
• Año de publicación: 2019
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: DIAMOND; NV CENTERS; OPTOMECHANICS; ANGULAR MOMENTUM
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Hybrid quantum systems exhibiting coupled optical, spin, and mechanical degrees of freedom can serve as a platform for sensing, or as a bus to mediate interactions between qubits with disparate energy scales. These systems are also creating opportunities to test foundational ideas in quantum mechanics, including direct observations of the quantum regime in macroscopic objects. Here, we make use of angular momentum conservation to study the dynamics of a pair of paramagnetic centers featuring different spin numbers in the presence of a properly tuned external magnetic field. We examine the interplay between optical excitation, spin evolution, and mechanical motion, and theoretically show that in the presence of continuous optical illumination, interspin cross relaxation must induce rigid rotation of the host crystal. The system dynamics is robust to scattering of spin-polarized phonons, a result we build on to show this form of angular momentum transfer should be observable using state-of-the-art torsional oscillators or trapped nanoparticles.
Fil: Zangara, Pablo René. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Física Enrique Gaviola. Universidad Nacional de Córdoba. Instituto de Física Enrique Gaviola; Argentina. City College of New York; Estados Unidos
Fil: Wood, Alexander. University of Melbourne; Australia
Fil: Doherty, Marcus W.. Australian National University; Australia
Fil: Meriles, Carlos A.. City College of New York; Estados Unidos