All posts by cmeriles_1ry5wvws

02-22: International delegation from Latin America visits our lab

A Latin-American delegation that included the Consul Generals from Argentina, Colombia, El Salvador, Guatemala, Honduras, Mexico, Paraguay, Peru, and Bolivia recently visited CCNY with the goal to establish a scientific collaboration.  The photos below capture some highlights during the stop they made in our lab.

The image shows Richard guiding the delegation into our lab.

Here is Richard again, explaining some of his latest results.

This time, Carlos explains part of our work on the use of spins for quantum technologies.

01-22: Our paper on a route to mw-free DNP goes live in PRL

Dynamic Nuclear Polarization (DNP) presently stands as the preferred strategy to enhance the sensitivity of nuclear magnetic resonance measurements, but its application relies on the use of high-frequency microwave to manipulate electron spins, an increasingly demanding task as the applied magnetic field grows. Here we investigate the dynamics of a system hosting a polarizing agent formed by two distinct paramagnetic centers near a level anti-crossing. We theoretically show that nuclear spins polarize efficiently under a cyclic protocol that combines alternating thermal jumps and radio-frequency pulses connecting hybrid states with opposite nuclear and electronic spin alignment. Central to this process is the difference between the spin-lattice relaxation times of either electron spin species, transiently driving the electronic spin bath out of equilibrium after each thermal jump. Without the need for microwave excitation, this route to enhanced nuclear polarization may prove convenient, particularly if the polarizing agent is designed to feature electronic level anti-crossings at high magnetic fields.