Luo Zhu-Xi, Lake Ethan, Mei Jia-Wei, Starykh Oleg A
Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.
Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, USA.
Phys Rev Lett. 2018 Jan 19;120(3):037204. doi: 10.1103/PhysRevLett.120.037204.
We describe electron spin resonance in a quantum spin liquid with significant spin-orbit coupling. We find that the resonance directly probes spinon continuum, which makes it an efficient and informative probe of exotic excitations of the spin liquid. Specifically, we consider spinon resonance of three different spinon mean-field Hamiltonians, obtained with the help of projective symmetry group analysis, which model a putative quantum spin liquid state of the triangular rare-earth antiferromagnet YbMgGaO_{4}. The band of absorption is found to be very broad and exhibit strong van Hove singularities of single spinon spectrum as well as pronounced polarization dependence.
我们描述了具有显著自旋轨道耦合的量子自旋液体中的电子自旋共振。我们发现，这种共振直接探测了自旋子连续体，这使其成为自旋液体奇异激发的一种有效且信息丰富的探针。具体而言，我们考虑了三种不同的自旋子平均场哈密顿量的自旋子共振，这些哈密顿量是借助投影对称群分析得到的，它们模拟了三角稀土反铁磁体YbMgGaO₄假定的量子自旋液体态。发现吸收带非常宽，并且表现出单自旋子谱的强烈范霍夫奇点以及明显的偏振依赖性。
