论文标题
奇怪的金属散射在电子掺杂$ {\ rm la} _ {2-x} {\ rm ce} _x {\ rm cuo} _4 $的动量空间中的演变。
Evolution of the strange-metal scattering in momentum space of electron-doped ${\rm La}_{2-x}{\rm Ce}_x{\rm CuO}_4$
论文作者
论文摘要
线性温度电阻率是高温铜层超导体的奇怪金属状态中的重要奥秘之一。为了揭示这种异常的属性，能量依赖性的虚构部分自我能量im $ {\ rmσ}（k，ω）$保留了关键信息。在这里，我们进行了系统的兴奋剂，动量和温度依赖性角度分辨光谱测量电子掺杂的铜$ {\ rm la} _ {\ rm la} _ {2-x} {\ rm ce} _x {\ rm cuo} _4 $ _4 $ _4 $，并提取了奇异的金属散射的进化。在低掺杂水平和低温下，im $ {\rmς} \ proptoω$依赖性主导了整个动量空间。对于高掺杂水平和高温，iM $ {\rmς} \ proptoω^2 $从抗腹区开始显示。通过与孔掺杂的蛋饼$ {\ rm la} _ {2-x} {\ rm sr} _x {\ rm cuo} _4 $和$ {\ rm bi} _2 _2散射速率的二分法沿着节点和抗邻近方向存在，这在丘比特家族中无处不在。我们的作品为丘比特的奇怪金属状态提供了新的见解。
The linear-in-temperature resistivity is one of the important mysteries in the strange metal state of high-temperature cuprate superconductors. To uncover this anomalous property, the energy-momentum-dependent imaginary part of the self-energy Im ${\rm Σ}(k, ω)$ holds the key information. Here we perform systematic doping, momentum, and temperature-dependent angle-resolved photoemission spectroscopy measurements of electron-doped cuprate ${\rm La}_{2-x}{\rm Ce}_x{\rm CuO}_4$ and extract the evolution of the strange metal scattering in momentum space. At low doping levels and low temperatures, Im ${\rmΣ} \propto ω$ dependence dominates the whole momentum space. For high doping levels and high temperatures, Im ${\rmΣ} \propto ω^2$ shows up, starting from the antinodal region. By comparing with the hole-doped cuprates ${\rm La}_{2-x}{\rm Sr}_x{\rm CuO}_4$ and ${\rm Bi}_2{\rm Sr}_2{\rm CaCu}_2{\rm O}_8$, we find a dichotomy of the scattering rate exists along the nodal and antinodal direction, which is ubiquitous in the cuprate family. Our work provides new insight into the strange metal state in cuprates.
