Theory of pseudogap and superconductivity in doped Mott insulators
Theory of pseudogap and superconductivity in doped Mott insulators
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DOI：
10.1002/andp.201100028
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发表时间：
2011-07
影响因子：
2.4
通讯作者：
M. Imada;Y. Yamaji;Shiro Sakai;Y. Motome
中科院分区：
文献类型：
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作者：
M. Imada;Y. Yamaji;Shiro Sakai;Y. Motome
欠掺杂的莫特绝缘体给多体物理带来了挑战。从单粒子格林函数的极点和零点结构的演化方面讨论了近期新的认识。在欠掺杂的铜氧化物中，赝能隙以及费米弧/口袋结构从动力学平均场理论的近期团簇扩展中得到了很好的重现。出现的共存零点和极点使欠掺杂的莫特绝缘体有别于费米液体，它们被拓扑相变分隔开。在 slave - boson框架下作为激子推广而提出的共费米子解释了零表面形成的起源。共费米子 - 准粒子杂化能隙为赝能隙和各种不寻常的莫特特性提供了一种自然的理解。此外，共费米子提供了一种新的配对机制，其中共费米子有两个作用：它作为准粒子的配对伙伴加强了库珀对，并且也起到了胶水的作用。它为解决能隙结构二分性中发现的难题提供了深刻的见解。
Underdoped Mott insulators provide us with a challenge of many‐body physics. Recent renewed understanding is discussed in terms of the evolution of pole and zero structure of the single‐particle Green's function. Pseudogap as well as Fermi arc/pocket structure in the underdoped cuprates is well reproduced from the recent cluster extension of the dynamical mean‐field theory. Emergent coexisting zeros and poles set the underdoped Mott insulator apart from the Fermi liquid, separated by topological transitions. The cofermion proposed as a generalization of exciton in the slave‐boson framework accounts for the origin of the zero surface formation. The cofermion‐quasiparticle hybridization gap offers a natural understanding of the pseudogap and various unusual Mottness. Furthermore the cofermion offers a novel pairing mechanism, where the cofermion has two roles: It reinforces the Cooper pair as a pair partner of the quasiparticle and acts as a glue as well. It provides a strong insight for solving the puzzle found in the dichotomy of the gap structure.