Investigations of dressed quasiparticles

穿过固体的电子与固体的所有元激发密切相关，因此它在运动时会拖着沿着各种可能的激发云。这种复杂的实体被称为“着装准粒子”。当与原始电子相比时，它具有随着增加的有效质量而改变的色散，以及其光谱功能的分离，例如通过光发射测量，分为相干和非相干部分。在某些情况下，敷料是如此之强，它可能不会遵循粒子的运动，导致完全不相干的传播和传统的费米液体理论的崩溃。正是对这些穿着的准粒子及其对固体物理性质的影响的理解，推动了理论凝聚态物理学的发展。

An electron moving through a solid is intimately connected with all the elementary excitations of the solid, and therefore it drags along, as it moves, a cloud of various possible excitations. This complex entity is known as a "dressed quasiparticle". When compared to the original electron, it has a changed dispersion with an increased effective mass, and a separation of its spectral function, as measured for example by photo-emission, into a coherent and an incoherent part. In some cases the dressing is so strong that it may not follow the particle's motion at all, leading to completely incoherent propagation and a breakdown of the conventional Fermi-liquid theories. It is the understanding of these dressed quasiparticles and their influence on the physical properties of the solid, that drives the world of theoretical condensed matter physics.