论文标题
重合角度分辨光发射光谱：检测两粒子相关的建议
Coincidence angle-resolved photoemission spectroscopy: Proposal for detection of two-particle correlations
论文作者
论文摘要
角度分辨光发射光谱（ARPES）是研究材料电子结构的强大实验技术。由于许多电子材料都表现出异常的多体相关性，因此直接检测这些多体相关性的技术将在其多体物理学的研究中起重要作用。在本文中，我们提出了一种直接检测两个粒子相关性的技术，即巧合（鲤鱼），其中两个入射光子激发了两个相互检测到的光电子。虽然单光子吸收和一光电信发射ARPE提供了单粒子光谱函数，但提出的具有两光子吸收的鲤鱼和两光片的鲤鱼与两晶状体盐酸 - 盐酸球波函数有关。详细研究了鲤鱼和Bardeen-Cooper-Schrieffer（BCS）超导状态的鲤鱼的巧合检测概率的示例。我们还提出了另外两种实验技术，即一致的角度分辨光发射和逆光功能光谱（CARP/IPES）以及一个重合角度分辨的逆向光表射击光谱（Caripes）。由于所有这些提出的巧合技术都可以提供两粒子频率骨盐波函数，因此它们可以显示粒子粒子或粒子孔通道中材料电子的动量和依赖性的两粒子动力学物理。因此，可以引入它们以研究超导体中的库珀对物理，金属铁磁铁/抗fiferromagnet中的静电磁性以及金属列态的颗粒孔对物理学。此外，由于两粒子浆盐波的功能也涉及内对动力学物理，因此这些提出的巧合技术可用于研究内对延迟的物理学。
The angle-resolved photoemission spectroscopy (ARPES) is one powerful experimental technique to study the electronic structure of materials. As many electron materials show unusual many-body correlations, the technique to detect directly these many-body correlations will play important roles in the study of their many-body physics. In this article, we propose a technique to detect directly the two-particle correlations, a coincidence ARPES (cARPES) where two incident photons excite two respective photoelectrons which are detected in coincidence. While the one-photon-absorption and one-photoelectron-emission ARPES provides the single-particle spectrum function, the proposed cARPES with two-photon absorption and two-photoelectron emission is relevant to a two-particle Bethe-Salpeter wave function. Examples of the coincidence detection probability of the cARPES for a free Fermi gas and a Bardeen-Cooper-Schrieffer (BCS) superconducting state are studied in detail. We also propose another two experimental techniques, a coincidence angle-resolved photoemission and inverse-photoemission spectroscopy (cARP/IPES) and a coincidence angle-resolved inverse-photoemission spectroscopy (cARIPES). As all of these proposed coincidence techniques can provide the two-particle frequency Bethe-Salpeter wave functions, they can show the momentum and energy dependent two-particle dynamical physics of the material electrons in the particle-particle or particle-hole channel. Thus, they can be introduced to study the Cooper-pair physics in the superconductor, the itinerant magnetism in the metallic ferromagnet/antiferromagnet, and the particle-hole pair physics in the metallic nematic state. Moreover, as the two-particle Bethe-Salpeter wave functions also involve the inner-pair dynamical physics, these proposed coincidence techniques can be used to study the inner-pair time-retarded physics.
