Browsing by Author "Pinto, Felipe"

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    Perfect conductor and mu-metal enhancement of effects in electromagnetic fields over single emitters near topological insulators
    (2024) Dvorquez, Eitan; Pavez, Benjamin; Sun, Qiang; Pinto, Felipe; Greentree, Andrew D.; Gibson, Brant C.; Maze, Jeronimo R.
    We focus on the transmission and reflection coefficients of light in systems involving topological insulators (TIs). Due to the electromagnetic coupling in TIs, new mixing coefficients emerge, leading to new components of the electromagnetic fields of propagating waves. We have discovered a simple heterostructure that provides a 100-fold enhancement of the mixing coefficients for TI materials. Such effect depends on the TI's wave impedance and the selected material for the sublayer. We also predict a transverse deviation of the Poynting vector due to these mixed coefficients contributing to the radiative electromagnetic field of an electric dipole. Given an optimal configuration of the dipole-TI system, this deviation could amount to 0.28% of the Poynting vector due to emission near nontopological materials, making this effect detectable.
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    Photophysics of a single quantum emitter based on vanadium phthalocyanine molecules
    (2024) Escalante, Richard A.; Athpal, Mohan C.; Ruiz-Tagle, Catalina; Lvarado, Vicente H.; Pinto, Felipe; Martinez, Luis J.; Gence, Loik; Garcia, Griselda; Gonzalez, Iyan A.; Maze, Jeronimo R.
    Single quantum emitters play a fundamental role in the development of quantum technologies such as quantum repeaters, and quantum information processing. Isolating individual molecules with stable optical emission is an essential step for these applications, especially for those molecules that present large coherence times at room temperature. Among them, vanadium-oxide phthalocyanine (VOPc) molecules stand out as promising candidates due to the large coherence times of their ground state electronic spin, which are on the order of microseconds when measured in the ensemble. However, the optical properties of such VOPc molecules at the single emitter level have not yet been reported. Here we show that single VOPc molecules with stable optical properties at room temperature can be isolated. We find that the optical response of the molecule under laser illumination of different polarizations agrees well with a system having pyramidal C4vsymmetry. 4 v symmetry. Furthermore, we provide theoretical calculations that support our experimental findings and provide insight into the role of phonons and the internal electronic structure of the molecule. These results demonstrate that this single paramagnetic molecule can function as a single quantum emitter while displaying optical stability under ambient conditions to have their intrinsic properties investigated.