Topological transition and Majorana zero modes in 2D non-Hermitian chiral superconductor with anisotropy.

We study a non-Hermitian chiral topological superconductor system on two dimensional square lattice, from which we obtained a rich topological phase diagram and established an exact relationship between topological charge flow of exceptional points in generalized Brillouin zone and change of topological properties. Its rich topological phase diagram is the result of competition between anisotropy and non-Hermitian effect. This system belongs to class D according to AZ classification of non-Hermitian systems.

The polarization and the fundamental sensitivity of K (Cs)-Rb-He hybrid optical pumping spin exchange relaxation free atomic magnetometers.

The hybrid optical pumping spin exchange relaxation free (SERF) atomic magnetometers can realize ultrahigh sensitivity measurement of magnetic field and inertia. We have studied the Rb polarization of two types of hybrid optical pumping SERF magnetometers based on K-Rb-He and Cs-Rb-He respectively. Then we found that Rb polarization varies with the number density of buffer gas He and quench gas N, pumping rate of pump beam and cell temperature respectively, which will provide an experimental guide for the design of the magnetometer.