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首页> 外文期刊>Physical review >Entangled tetrahedron ground state and excitations of the magnetoelectric skyrmion material Cu_2OSeO_3
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Entangled tetrahedron ground state and excitations of the magnetoelectric skyrmion material Cu_2OSeO_3

机译：纠缠四面体的基态与磁电天空粒子材料Cu_2OSeO_3的激发

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The strongly correlated cuprate Cu_2OSeO_3 has been recently identified as the first insulating system exhibiting a skyrmion lattice phase. Using a microscopic multiboson theory for its magnetic ground state and excitations, we establish the presence of two distinct types of modes: a low-energy manifold that includes a gapless Goldstone mode and a set of weakly dispersive high-energy magnons. These spectral features are the most direct signatures of the fact that the essential magnetic building blocks of Cu_2OSeO_3 are not individual Cu spins, but rather weakly coupled Cu_4 tetrahedra. Several of the calculated excitation energies are in excellent agreement with terahertz electron spin resonance, Raman, and far-infrared experiments, while the magnetoelectric effect determined within the present quantum-mechanical framework is also fully consistent with experiments, giving strong evidence in the entangled Cu_4 tetrahedra picture of Cu_2OSeO_3. The predicted energy and momentum dependence of the dipole and quadrupole spin structure factors call for further experimental tests of this picture.
机译：最近已将高度相关的铜酸盐Cu_2OSeO_3鉴定为显示天蝎子晶格相的第一个绝缘体系。利用微观玻色子理论对其磁基态和激发进行了研究，我们确定了两种不同类型的模式的存在：一种低能流形，包括无间隙的戈德斯通模式和一组弱色散高能磁振子。这些光谱特征是Cu_2OSeO_3的基本磁性构件不是单个的Cu自旋，而是弱耦合的Cu_4四面体这一事实的最直接特征。几种计算出的激发能与太赫兹电子自旋共振，拉曼和远红外实验非常吻合，而在当前量子力学框架内确定的磁电效应也与实验完全一致，在纠缠的Cu_4中提供了有力的证据Cu_2OSeO_3的四面体图片。偶极子和四极子自旋结构因子的预测能量和动量相关性要求对此图片进行进一步的实验测试。

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