太赫兹场对La0.5Sr 1.5MnO 4中面内轨道有序度的控制
THz Field Control of In-Plane Orbital Order in La0.5Sr1.5MnO4
摘要：
面内各向异性基态普遍存在于相关固体如磷属元素化物、铜酸盐和锰氧化物中。它们可以从掺杂莫特绝缘体中产生，并与超导体等相竞争，但它们的起源仍有争议。晶格、电荷、轨道和自旋自由度之间的强耦合导致多个参数同时有序化，掩盖了驱动转变的机制。我们证明了锰氧化物中的各向异性轨道域可以通过脉冲太赫兹光场的偏振取向。通过应用哈伯德模型，我们表明，域控制可以通过电场辅助跳跃的电荷或场诱导的键角修改。这两种途径都增强了局部库仑排斥，驱动域重取向和主导机制是由平衡Mn-O-Mn键角。我们的研究结果突出了库仑相互作用在锰氧化物中驱动轨道顺序所发挥的关键作用，并展示了如何以新的方式利用THz来理解和操纵各种相关材料中的各向异性相。
英文摘要：
In-plane anisotropic ground states are ubiquitous in correlated solids such as pnictides, cuprates and manganites. They can arise from doping Mott insulators and compete with phases such as superconductivity, however their origins are debated. Strong coupling between lattice, charge, orbital and spin degrees of freedom results in simultaneous ordering of multiple parameters, masking the mechanism that drives the transition. We demonstrate that the anisotropic orbital domains in a manganite can be oriented by the polarization of a pulsed THz light field. Through the application of the Hubbard model, we show that domain control can be achieved either through field assisted hopping of charges or a field-induced modification of bond angles. Both routes enhance the local Coulomb repulsions which drive domain reorientation and the dominant mechanism is dictated by the equilibrium Mn-O-Mn bond angle. Our results highlight the key role played by the Coulomb interaction in driving orbital order in manganites and demonstrate how THz can be utilized in new ways to understand and manipulate anisotropic phases in a broad range of correlated materials.
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