Momentum-dependent charge excitations of a two-leg ladder : Resonant inelastic x-ray scattering of(La, Sr, Ca)_<14> Cu_<24> O_<41>
Momentum-dependent charge excitations of a two-leg ladder : Resonant inelastic x-ray scattering of(La, Sr, Ca)_<14> Cu_<24> O_<41>
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两腿梯子的动量相关电荷激发：(La, Sr, Ca)_<14> Cu_<24> O_<41> 的共振非弹性 X 射线散射
DOI：
10.1103/physrevb.76.045124
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
and K. Kumaga
中科院分区：
文献类型：
--
作者：
K. Ishii;K. Tsutsui;T. Tohyama;T. Inami;J. Mizuki;Y. Murakami;Y. Endoh;S. Maekawa;K. Kudo;Y. Koike;and K. Kumaga
通过共振非弹性 X 射线散射研究了两腿梯子的动量相关电荷激发。与方形晶格的情况相反，梯子的莫特间隙激发的动量依赖性在空穴掺杂时表现出很小的变化，表明空穴对的形成。基于哈伯德模型的理论计算定性地解释了这一特征。此外，实验数据显示带内激励为莫特间隙以下的连续强度，并且它同时出现在所有动量转移处。带内激发的强度与梯子的空穴浓度成正比，这与光导率测量一致。
Momentum-dependent charge excitations of a two-leg ladder are investigated by resonant inelastic x-ray scattering of. In contrast to the case of a square lattice, momentum dependence of the Mott gap excitation of the ladder exhibits little change upon hole doping, indicating the formation of hole pairs. Theoretical calculation based on a Hubbard model qualitatively explains this feature. In addition, experimental data show an intraband excitation as continuum intensity below the Mott gap and it appears at all the momentum transfers simultaneously. The intensity of the intraband excitation is proportional to the hole concentration of the ladder, which is consistent with optical conductivity measurements.