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arXiv · 2109.06518

Magnon Condensation in Dimerized Antiferromagnets with Spin-Orbit Coupling

Qi-Rong Zhao·Meng-Jie Sun·Zheng-Xin Liu·Jiucai Wang
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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 ($\Gamma'$ 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 N\'{e}el 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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Qi-Rong Zhao, Meng-Jie Sun, Zheng-Xin Liu, Jiucai Wang. 2021-09-14. Magnon Condensation in Dimerized Antiferromagnets with Spin-Orbit Coupling. https://doi.org/10.1103/physrevb.105.094401

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