Magnetic field induced spin liquids and quantum phase transitions in spin orbit coupled quantum magnets.

When an external magnetic field suppressed the magnetic ordering in spin-orbit coupled system, a new magnetic phase is often observed. For example, controversial theoretical and experimental results propose spin liquid behavior above in-plane 7 T where antiferromagnetic order is suppressed in a-RuCl3. Theoretical studies also show that out-of-plane magnetic field can induce spin liquid phase in this system as well. In this work, we present the analysis of inelastic neutron scattering data of a-RuCl3 and extracted g-factor and the Γ/J using linear spin wave theory. In addition, we present the out-of-plane pulsed field data of a-RuCl3 to study a new phases predicted by theoretical studies by drawing the full field vs temperature phase diagram. We also explore the how the magnetic field breaks the orbital assisted spin dimerized phase in one dimensional spin chains, and new magnetic phases are induced to discuss the role of the orbital degrees of freedom in rescale the Hund coupling and on-site interorbital Coulomb interactions in spin-orbit coupled systems.