Valla T, Fedorov AV, Johnson PD, Xue J, Smith KE, DiSalvo FJ
Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
Phys Rev Lett. 2000 Nov 27;85(22):4759-62. doi: 10.1103/PhysRevLett.85.4759.
The self-energy of the photohole in 2H-TaSe2 is measured by angle-resolved photoemission spectroscopy as a function of binding energy and temperature. In the charge-density wave (CDW) state, a structure in the self-energy is detected at approximately 65 meV that cannot be explained by electron-phonon scattering. A reduction in the scattering rates below this energy indicates the collapse of a major scattering channel with the formation of the CDW state accompanying the appearance of a bosonic "mode" in the excitation spectrum of the system.
通过角分辨光电子能谱测量了2H-TaSe2中空穴的自能随结合能和温度的变化。在电荷密度波（CDW）状态下，在约65毫电子伏特处检测到自能中的一种结构，该结构无法用电子-声子散射来解释。低于此能量的散射率降低表明，随着系统激发谱中出现一个玻色子“模式”，伴随CDW态的形成，一个主要散射通道发生了崩塌。
