非线性Klein-Gordon晶格的动力学结构因子
Dynamical structure factor of a nonlinear Klein-Gordon lattice
摘要：
本文用数值方法计算了非线性Klein-Gordon晶格的量子模[L. Proville，Phys.Rev.B71，104306（2005）]。在现场的非线性已被发现，导致声子束缚态。本文通过数值计算动力学结构因子来模拟低温相干散射截面。非弹性贡献作为现场非谐性的函数进行了研究。有趣的是，我们的数值方法不仅限于弱非谐性，并允许一个深入研究的非线性声子的光谱。
英文摘要：
The quantum modes of a nonlinear Klein-Gordon lattice have been computed numerically [L. Proville, Phys. Rev. B 71, 104306 (2005)]. The on-site nonlinearity has been found to lead to phonon bound states. In the present paper, we compute numerically the dynamical structure factor so as to simulate the coherent scattering cross section at low temperature. The inelastic contribution is studied as a function of the on-site anharmonicity. Interestingly, our numerical method is not limited to the weak anharmonicity and permits one to study thoroughly the spectra of nonlinear phonons.
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