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arXiv 1904.00530cond-mat.str-el
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用共振非弹性X射线散射理论研究双梯结构的自旋和电荷动力学

Theoretical study of the spin and charge dynamics of two-leg ladders as probed by resonant inelastic x-ray scattering

Umesh Kumar, Alberto Nocera, Elbio Dagotto, Steven Johnston

摘要:

共振非弹性X射线散射(RIXS)已成为研究相关材料中元激发的重要工具。在这里,我们提出了一个系统的理论研究的铜L-边缘RIXS光谱的未掺杂和掺杂的铜氧化物两个腿自旋梯在非自旋守恒(NSC)和自旋守恒(SC)的渠道。光谱是丰富的和主机许多外来的激发。在非掺杂的情况下,我们确定了一个三重子和绑定$\textit{triplet}$两个三重子激发强横档耦合限制,以及限制自旋弱横档耦合限制。在掺杂的情况下,我们观察到一个准粒子激发形成的束缚电荷和自旋$\frac{1}{2}$在强横档耦合限制。在SC-通道中,我们还确定了几个新的功能,包括绑定$\textit{singlet}$两个三重子激发和限制自旋在未掺杂的梯子在强和弱横档耦合限制,分别。相反,在掺杂的情况下,SC通道主要探测无隙和有隙电荷激发。最后,我们重新审视了现有的数据为梯形化合物Sr $_{14}$ Cu $_{24}$ O $_{41}$在我们的研究结果的背景下。

英文摘要:

Resonant inelastic x-ray scattering (RIXS) has become an important tool for studying elementary excitations in correlated materials. Here, we present a systematic theoretical investigation of the Cu L-edge RIXS spectra of undoped and doped cuprate two-leg spin-ladders in both the non-spin-conserving (NSC) and spin-conserving (SC) channels. The spectra are rich and host many exotic excitations. In the NSC-channel of the undoped case, we identify one-triplon and bound $\textit{triplet}$ two-triplon excitations in the strong-rung coupling limit, as well as confined spinons in the weak-rung coupling limit. In the doped case, we observe a quasiparticle excitation formed from a bound charge and spin-$\frac{1}{2}$ in the strong-rung coupling limit. In the SC-channel, we also identify several new features, including bound $\textit{singlet}$ two-triplon excitations and confined spinons in the undoped ladders in the strong- and weak-rung coupling limits, respectively. Conversely, in the doped case, the SC channel primarily probes both gapless and gapped charge excitations. Finally, we revisit the available data for the ladder compound Sr$_{14}$Cu$_{24}$O$_{41}$ in the context of our results.

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