Magnon Condensation in Dimerized Antiferromagnets with Spin-Orbit Coupling

Abstract

Bose-Einstein condensation (BEC) of triplet excitations triggered by a magnetic field, sometimes called magnon BEC, in dimerized antiferromagnets gives rise to a long-range antiferromagnetic order in the plane perpendicular to the applied magnetic field. To explore the effects of spin-orbit coupling on magnon condensation, we study a spin model on a distorted honeycomb lattice with dimerized Heisenberg exchange ($J$ terms) and uniform off-diagonal exchange (${\Gamma }^{\prime }$ terms) interactions. Via variational Monte Carlo calculations and spin-wave theory, we find that an out-of-plane magnetic field can induce different types of long-range magnetic orders, no matter if the ground state is a non-magnetic dimerized state or an ordered Néel state. Furthermore, the critical properties of field-driven phase transitions in the presence of spin-orbit couplings, as illustrated from spin-wave spectrum and interpreted by effective field theory, can be different from the conventional magnon BEC. Our study is helpful to understand the rich phases of spin-orbit coupled antiferromagnets induced by magnetic fields.

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Cited by in corpus (5)

• Beyond Kitaev physics in strong spin-orbit coupled magnets
• Bose-Einstein condensation in honeycomb dimer magnets and $\mathrm{Y}{\mathrm{b}}_2\mathrm{S}{\mathrm{i}}_2{\mathrm{O}}_7$
• Sinusoidal magnetic field induced topological excitations in a spin-orbit coupled spinor condensate
• Bose-Einstein condensations of magnons in quantum magnets with spin-orbit coupling in a Zeeman field
• Ground state of the staggered Heisenberg-$\Gamma$ honeycomb model in a magnetic field