Search

We describe a dual-axis atomic spin comagnetometer for rotation sensing using a single laser beam. A circularly polarized laser is used to pump the co-located atomic ensembles of alkali metal and noble gas and probe their gyroscopic precession at the same time, which is different from the traditional two-beam orthogonal pump-probe configuration. Combined with magnetic field modulations perpendicular to the laser propagating direction, the comagnetometer could measure dual-axis rotation rates simultaneously. This system is demonstrated theoretically and experimentally. A rotation sensitivity of 5.1 × 10–7 rad s−1 Hz−1∕2 and a bias instability of 0.016 °/h have been achieved. The theory and method presented here shed light on the way to miniaturize the comagnetometer with high precision for practical applications. [ABSTRACT FROM AUTHOR]

We describe a dual-axis atomic spin gyroscope based on an alkali metal-noble gas comagnetometer. Alkali metal vapor is optically pumped, and then the noble gas is hyperpolarized along the z axis. When sensing a transverse rotation, the polarized noble gas will be induced to precess and produce an effective magnetic field in the x – y plane for alkali metals to precess under. Operating in the spin-exchange relaxation-free regime, alkali atoms are modulated by the z axis magnetic field and serve as an integrated in-situ dual-axis magnetometer to detect the gyroscopic precession in the x and y axes simultaneously, using a single probe beam. By using the parametric modulation technique, the low frequency drift is effectively suppressed and a bias instability of less than 0.05 deg/h has been achieved in our dual-axis atomic spin gyroscope. [ABSTRACT FROM AUTHOR]

Based on density functional theory, we study the intrinsic anomalous Hall conductivity (AHC) of monolayer (ML) CrI 3 in different magnetic configurations. We find that ML CrI 3 in both the in-plane and off-plane ferromagnetic (FM) states hosts significant AHC, with quantum plateaus occurring at topologically nontrivial bandgaps. In the in-plane FM state, the AHC of ML CrI 3 depends sensitively on the magnetization direction. First, the sign of AHC can be inverted whenever the magnetization angle increases by 60 °. Second, the AHC vanishes if the magnetization angle is equal to the odd times of 30 °. By doping electrons and applying moderate strain, one can switch the magnetic ground state between the off- and in-plane FM states and manipulate the magnitude and sign of the AHC. Based on these features of AHC of ML CrI 3 , we propose a theoretical model to realize the functions of spintronic devices such as the reversible spin transport, magnetic sensors, or magnetic read-in head. [ABSTRACT FROM AUTHOR]