青铜中的非相干孤子激发和自旋-电荷分离
Incoherent Soliton Excitations and Spin-Charge Separation in Blue Bronze
摘要：
我们提出了新的高分辨率角分辨光电子能谱（ARPES）数据K $_{0.3}$钼$_3$（蓝青铜），并提出了一种新的理论描述这些结果。观察到的费米面，两个准一维片，是一致的梯形材料与弱梯间耦合。因此，我们的描述基于一维阶梯的谱特性。显着扩大的ARPES线形，一个电子伏特的重要部分，解释在自旋-电荷分离。一个高能量的功能，这是第一次在费米动量附近的光谱由于提高能量分辨率，被视为一个更高的能量束缚态的孤子激发的梯子上的签名。
英文摘要：
We present new high resolution angle resolved photoemission (ARPES) data for K$_{0.3}$MoO$_3$ (blue bronze) and propose a novel theoretical description of these results. The observed Fermi surface, with two quasi-one-dimensional sheets, is consistent with a ladder material with a weak inter-ladder coupling. Hence, we base our description on spectral properties of one-dimensional ladders. The marked broadening of the ARPES lineshape, a significant fraction of an eV, is interpreted in terms of spin-charge separation. A high energy feature, which is revealed for the first time in the spectra near the Fermi momentum thanks to improved energy resolution, is seen as a signature of a higher energy bound state of soliton excitations on a ladder.
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