Michael Romalis

TL;DR: In this article, the basic principles of modern optical magnetometers, discuss fundamental limitations on their performance, and describe recently explored applications for dynamical measurements of biomagnetic fields, detecting signals in NMR and MRI, inertial rotation sensing, magnetic microscopy with cold atoms, and tests of fundamental symmetries of nature.

TL;DR: A new spin-exchange relaxation-free (SERF) atomic magnetometer is described, and theoretical analysis shows that fundamental sensitivity limits of this device are below 0.01 fT Hz-1/2, which would enable new applications, including the possibility of mapping non-invasively the cortical modules in the brain.

TL;DR: A K magnetometer is demonstrated in which spin-exchange relaxation is completely eliminated by operating at high K density and low magnetic field, extending a previous theoretical analysis of spin exchange in low magnetic fields to arbitrary spin polarizations.

TL;DR: In this article, the authors describe an ultra-sensitive atomic magnetometer based on optically pumped potassium atoms operating in a spin exchange relaxation free regime, and demonstrate magnetic field sensitivity of 160 εaT/Hz1/2 in a gradiometer arrangement with a measurement volume of 0.45 cm3 and energy resolution per unit bandwidth of 44ℏ.

TL;DR: In this article, the authors report the results of a new experimental search for a permanent electric dipole moment of $ √ n √ 6 using a stack of four vapor cells.