arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0705.0818cond-mat.supr-concond-mat.str-elnucl-th
收藏

高温超导k依赖SU(4)模型及其相干态解

k-dependent SU(4) model of high-temperature superconductivity and its coherent-state solutions

Yang Sun, Mike Guidry, Cheng-Li Wu

摘要:

我们将高T_c超导的SU(4)模型[1-5]扩展到SU(4)k模型,该模型允许在预测的观测值中显式地依赖于动量(k)。我们从SU(4)k相干态导出并求解了依赖于k、温度和掺杂的带隙方程,并证明了新的SU(4)k模型对于不明显依赖于动量的观测量简化为原始的SU(4)模型。SU(4)k模型的结果与ARPES等实验有关,这些实验可以检测出明显依赖于k的性质。目前的SU(4)k模型定量描述了赝能隙温标,并可以解释为什么ARPES测量的沿反节方向的T* 比其他不分解动量的测量值大。它也提供了一个直接的微观解释费米弧中观察到的赝隙区。此外,该模型导致一个预测,即使在欠掺杂制度,存在掺杂依赖的窗口周围的节点在k空间中,反铁磁性可能会完全抑制所有掺杂分数,允许纯超导状态存在。

英文摘要:

We extend the SU(4) model [1-5] for high-Tc superconductivity to an SU(4)k model that permits explicit momentum (k) dependence in predicted observables. We derive and solve gap equations that depend on k, temperature, and doping from the SU(4)k coherent states, and show that the new SU(4)k model reduces to the original SU(4) model for observables that do not depend explicitly on momentum. The results of the SU(4)k model are relevant for experiments such as ARPES that detect explicitly k-dependent properties. The present SU(4)k model describes quantitatively the pseudogap temperature scale and may explain why the ARPES-measured T* along the anti-nodal direction is larger than other measurements that do not resolve momentum. It also provides an immediate microscopic explanation for Fermi arcs observed in the pseudogap region. In addition, the model leads to a prediction that even in the underdoped regime, there exist doping-dependent windows around nodal points in the k-space, where antiferromagnetism may be completely suppressed for all doping fractions, permitting pure superconducting states to exist.

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。

↑