Dimensional tuning of electronic states under strong and frustrated interactions.
Dimensional tuning of electronic states under strong and frustrated interactions.
复制标题
强相互作用和受挫相互作用下电子态的尺寸调整。
DOI：
10.1103/physrevlett.100.186404
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发表时间：
2007
影响因子：
8.6
通讯作者：
F. Pollmann
中科院分区：
文献类型：
--
作者：
C. Hotta;F. Pollmann
我们研究了各向异性三角晶格上强相互作用无旋费米子的模型。在半填充和强排斥最近邻相互作用的极限时，费米子排列成条纹并形成绝缘状态。当粒子被掺杂时，它要么沿着条纹进行一维自由运动，要么垂直于条纹进行细分。这两次传播产生了电子态的尺寸调谐。我们研究了该相的稳定性并推导了一个有效的模型来描述低能激发。提出了谱函数，可用于通过实验检测电荷激发的特征。
We study a model of strongly interacting spinless fermions on an anisotropic triangular lattice. At half-filling and the limit of strong repulsive nearest-neighbor interactions, the fermions align in stripes and form an insulating state. When a particle is doped, it either follows a one-dimensional free motion along the stripes or fractionalizes perpendicular to the stripes. The two propagations yield a dimensional tuning of the electronic state. We study the stability of this phase and derive an effective model to describe the low-energy excitations. Spectral functions are presented which can be used to experimentally detect signatures of the charge excitations.