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arXiv 0802.1544cond-mat.str-elcond-mat.supr-con
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一维莫特绝缘体和具有边界的CDW态的局域态密度

Local density of states of 1D Mott insulators and CDW states with a boundary

Dirk Schuricht, Fabian H. L. Essler, Akbar Jaefari, Eduardo Fradkin

摘要:

我们确定了强杂质势存在下一维无公度电荷密度波(CDW)态的局域态密度。我们发现CDW被钉扎在杂质处,这导致在动量2k_F处LDOS的傅里叶变换中的奇异性。在以上的自旋间隙的能量,我们观察到分散功能与自旋和电荷的自由度分别。在存在杂质磁场的情况下,我们观察到了局限于杂质的束缚态的形成。通过交换自旋自由度和电荷自由度的作用,我们的结果可以推广到一维莫特绝缘体的情形。我们讨论了我们的结果的影响,如两个腿梯形铜氧化物和一维莫特绝缘体的自旋带隙系统的扫描隧道显微镜实验。

英文摘要:

We determine the local density of states (LDOS) of one-dimensional incommensurate charge density wave (CDW) states in the presence of a strong impurity potential, which is modeled by a boundary. We find that the CDW gets pinned at the impurity, which results in a singularity in the Fourier transform of the LDOS at momentum 2k_F. At energies above the spin gap we observe dispersing features associated with the spin and charge degrees of freedom respectively. In the presence of an impurity magnetic field we observe the formation of a bound state localized at the impurity. All of our results carry over to the case of one dimensional Mott insulators by exchanging the roles of spin and charge degrees of freedom. We discuss the implications of our result for scanning tunneling microscopy experiments on spin-gap systems such as two-leg ladder cuprates and 1D Mott insulators.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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