Isotopic Fingerprint of Electron-Phonon Coupling in High-Tc Cuprates
Isotopic Fingerprint of Electron-Phonon Coupling in High-Tc Cuprates
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DOI：
10.1103/physrevlett.101.157005
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发表时间：
2008-10-10
影响因子：
8.6
通讯作者：
Aiura, Y.
中科院分区：
文献类型：
--
作者：
Iwasawa, H.;Douglas, J. F.;Aiura, Y.
角分辨光电子能谱与低能量可调光子沿着的节点方向的氧同位素取代Bi 2Sr 2CaCu 2 O 8 + δ揭示了一个明显的氧同位素位移附近的电子-玻色子耦合的电子色散“扭结”。扭结位移的大小（几个meV）和方向是预期的，由于测量的声子频率的同位素位移，也与理论预期一致。这表明声子作为主导参与者的参与，以及精确定位最相关的声子分支。
Angle-resolved photoemission spectroscopy with low-energy tunable photons along the nodal direction of oxygen isotope substituted Bi2Sr2CaCu2O8+delta reveals a distinct oxygen isotope shift near the electron-boson coupling "kink" in the electronic dispersion. The magnitude (a few meV) and direction of the kink shift are as expected due to the measured isotopic shift of phonon frequency, and are also in agreement with theoretical expectations. This demonstrates the participation of the phonons as dominant players, as well as pinpointing the most relevant of the phonon branches.