arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0711.2009cond-mat.str-elcond-mat.supr-con
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自旋无序条纹的费米动量分辨电荷序

Fermi momentum resolved charge order for spin disordered stripes

M. Granath

摘要:

对于具有短程自旋条纹关联和长程电荷条纹有序的掺杂反铁磁体,我们发现电荷有序的表现形式随费米面动量的变化而突变。无序平均局域态密度几乎是完全均匀的,当只在对“波腹”谱权重有贡献的状态上积分时,它显示长程电荷条纹序,而当只在对“波腹”谱权重有贡献的状态上积分时,它显示长程电荷条纹序。一个有效的二维节状液体,因此可以共存的静电荷条纹提供没有静态自旋秩序。我们还研究了相称的自旋和电荷条纹有序系统的费米面由一个节孔袋和一个开放的“条纹带”部分。由于条纹的顺序孔密度和口袋的大小之间的关系将减少一个顺磁体相比,由一个因素的两个为偶数充电周期和四个为奇数充电周期,我们发现一个估计的上限上的孔口袋的面积分数为1.6%的充电周期4和4%的充电周期5。我们还讨论了为什么电子口袋预计不会为条纹有序系统,并表明开放的费米表面部分可能是电子一样的负霍尔系数。

英文摘要:

For a doped antiferromagnet with short-range spin stripe correlations and long-range charge stripe order we find that the manifestation of charge order changes abruptly as a function of momentum along the Fermi surface. The disorder averaged local density of states is almost perfectly homogeneous when integrated only over states which contribute to the ``nodal'' spectral weight whereas it displays long range charge stripe order when integrated only over states which contribute to the ``antinodal'' spectral weight. An effectively two dimensional nodal liquid can thus coexist with static charge stripes provided there is no static spin order. We also study commensurate spin and charge stripe ordered systems where the Fermi surface consists of a nodal hole pocket and an open ``stripe band'' section. Due to the stripe order the relation between hole density and size of a pocket will be reduced compared to a paramagnet by a factor of two for even charge period and four for odd charge period and we find an estimated upper limit on the area fraction of a hole pocket of 1.6% for charge period four and 4% for charge period five. We also discuss why electron pockets are not expected for a stripe ordered system and show that the open Fermi surface section may be electron like with a negative Hall coefficient.

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