Terahertz field control of in-plane orbital order in La0.5Sr1.5MnO4
Terahertz field control of in-plane orbital order in La0.5Sr1.5MnO4
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DOI：
10.1038/ncomms9175
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发表时间：
2015-09-01
影响因子：
16.6
通讯作者：
Wall, Simon
中科院分区：
文献类型：
--
作者：
Miller, Timothy A.;Chhajlany, Ravindra W.;Wall, Simon
平面内各向异性基态在相关固体中普遍存在，如镍、铜、锰矿等。它们可以由掺杂莫特绝缘体产生，并与超导相竞争；然而，它们的起源是有争议的。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，掩盖了驱动跃迁的机制。在这里，我们证明了在一个脉冲太赫兹光场的极化下，锰矿中的轨道域可以定向。通过Hubbard模型的应用，我们表明可以通过增强局部库仑相互作用来实现区域控制，从而驱动区域重定向。我们的研究结果突出了库仑相互作用在控制和操纵锰中轨道顺序方面所起的关键作用，并展示了一种利用太赫兹来理解和操纵潜在广泛相关材料中各向异性相的新方法。
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. Here we demonstrate that the orbital domains in a manganite can be oriented by the polarization of a pulsed THz light field. Through the application of a Hubbard model, we show that domain control can be achieved by enhancing the local Coulomb interactions, which drive domain reorientation. Our results highlight the key role played by the Coulomb interaction in the control and manipulation of orbital order in the manganites and demonstrate a new way to use THz to understand and manipulate anisotropic phases in a potentially broad range of correlated materials.