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首页> 外文期刊>Zeitschrift fur Physik, B. Condensed Matter >Theory of resonant Raman scattering from low-energy collective excitations of interacting electrons in quantum wires
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Theory of resonant Raman scattering from low-energy collective excitations of interacting electrons in quantum wires

机译：量子线中相互作用电子的低能集体激发引起的共振拉曼散射理论

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摘要

The Raman spectra of quantum wires in the region of electronic intra-band excitations are investigated using one- and two-band models based on the Luttinger approximation with spin. Structures related to charge and spin density modes are identified, and analyzed with respect to their behavior with photon energy and temperature. It is found that the low-energy peaks in the polarized spectra, close to resonance that are commonly assigned to "single particle excitations", can be interpreted as the signature of spin density excitations. A broad structure in the resonant depolarized spectrum is predicted above the frequency of the spin density excitations. This is due to simultaneous but independent propagation of spin and charge density modes. The results, when compared with experiment, show, that the electronic collective excitations of quantum wires at low energies are characteristic for a non-Fermi liquid.
机译：基于带自旋的Luttinger近似，使用一带和两带模型研究了电子带内激发区域中量子线的拉曼光谱。识别与电荷和自旋密度模式有关的结构，并就其在光子能量和温度下的行为进行分析。已经发现，偏振光谱中的低能量峰（通常接近于共振）通常被分配给“单个粒子激发”，可以解释为自旋密度激发的特征。在自旋密度激发的频率之上，预测了共振去极化频谱中的宽结构。这是由于自旋和电荷密度模式同时但独立地传播。与实验相比，结果表明，低能量子线的电子集体激发是非费米液体的特征。

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