Hu C D
Department of Physics and NCTS at TPE, National Taiwan University, Taipei, Taiwan, Republic of China.
Phys Rev Lett. 2004 Oct 8;93(15):157205. doi: 10.1103/PhysRevLett.93.157205. Epub 2004 Oct 5.
We study the photoemission spectrum of the double-exchange (DE) interaction systems. The DE Hamiltonian can be transformed into a simple form consisting of fermions and Schwinger bosons. We apply the gauge-field model and calculate the Green's function of the gauge field, fermions, and bosons. The imaginary part of the Green's function of an electron has an asymmetrical peak with strong temperature dependence. This can explain why the shape of the angle-resolved photoemission spectra of manganites near the Fermi surface is very different from that of Fermi liquid. We also show why the position of the Fermi surface is not sensitive to temperature.
我们研究了双交换（DE）相互作用系统的光电子能谱。DE哈密顿量可以转化为由费米子和施温格玻色子组成的简单形式。我们应用规范场模型并计算规范场、费米子和玻色子的格林函数。电子格林函数的虚部有一个强烈依赖温度的不对称峰。这可以解释为什么锰氧化物在费米面附近的角分辨光电子能谱的形状与费米液体的非常不同。我们还展示了为什么费米面的位置对温度不敏感。
