标题： 重费米子体系中能依赖散射主导热电效应的证据 显示英文标题

标题： Evidence for energy-dependent scattering dominating thermoelectricity in heavy fermion systems

摘要： 在热电材料与器件领域，提高能量转换效率仍然是一个长期的挑战。作为一种有望解决这一问题的途径，超越普通恒定弛豫时间近似（CRTA）调节电子散射机制的方法已被提出。然而，尚缺乏能反映在赛贝克系数中的能量相关散射的直接实验证据。在此，我们通过角分辨光电子能谱证明，重费米子准粒子的弛豫时间在费米能级附近高度依赖于能量。观察到的弛豫时间的能量依赖性是由于相干Kondo散射引起的，它能够合理地描述赛贝克系数的符号，而这一点无法从CRTA推导得出。我们的发现不仅加深了对关联材料中热电效应的理解，也为热电材料的轨道选择性工程提供了新的视角。 显示英文摘要

摘要： In the field of thermoelectric materials and devices, improving energy conversion efficiency remains a long-standing challenge. As a promising approach to address this issue, tuning the electron-scattering mechanisms beyond the ordinary constant relaxation time approximation (CRTA) has been proposed. However, direct experimental evidence for an energy-dependent scattering reflected in the Seebeck coefficient is still lacking. Here we demonstrate using angle-resolved photoemission spectroscopy that the relaxation time of heavy fermion quasiparticles is highly dependent on the energy near the Fermi level. The observed energy dependence of the relaxation time is due to the coherent Kondo scattering, describing the sign of the Seebeck coefficient reasonably well, which cannot be deduced from CRTA. Our findings provide not only deeper insight into the understanding of thermoelectricity in correlated materials, but also new perspectives on possible orbital-selective engineering of thermoelectric materials.