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Emergence of pure spin current in doped excitonic magnets

机译:掺杂兴奋磁铁中纯旋转电流的出现

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摘要

An excitonic magnet hosts a condensate of spin-triplet excitons composed of conduction-band electrons and valence-band holes and may be described by the two-orbital Hubbard model. When the Hamiltonian has the nearest-neighbor interorbital hopping integrals with d-wave symmetry and the number of electrons is slightly away from half filling, the k-space spin texture appears in the excitonic phase with a broken time-reversal symmetry. We then show that, applying electric field to this doped excitonic magnet along a particular direction, a pure spin current emerges along its orthogonal direction. We discuss possible experimental realization of this type of the pure spin current in actual materials.
机译:兴奋磁体托管由导电带子电子和价带孔组成的旋转三重型激子的冷凝物,并且可以由双轨道隆巴德模型描述。当Hamiltonian具有与D波对称的最近邻的闭合跳跃积分并且电子的数量略微远离半填充时,K空间旋转纹理出现在激发相中,具有破裂的时间反转对称。然后,我们表明,沿着特定方向将电场施加到该掺杂的激子磁铁,纯旋转电流沿其正交方向出现。我们讨论了实际材料中这种类型的纯旋转电流的可能实验。

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  • 来源
    《Physical review》 |2020年第17期|174428.1-174428.7|共7页
  • 作者单位

    Department of Physics Chiba University Chiba 263-8522 Japan;

    Department of Physics Keio University Yokohama 223-8522 Japan;

    Department of Physics Chiba University Chiba 263-8522 Japan;

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  • 正文语种 eng
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