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Antiferromagnetic Correlation and the Pairing Mechanism of the Cuprates and Iron Pnictides : a View From the Functional Renormalization Group Studies
Fa Wang, Hui Zhai, Dunghai Lee
We compare the one-loop functional renormalization group results for the cuprates and the iron pnictides. Interestingly a coherent picture suggesting that antiferromagnetic correla…
Universal linear-temperature dependence of static magnetic susceptibility in iron-pnictides
Guang-Ming Zhang, Yue-Hua Su, Zhong-Yi Lu +3
A universal linear-temperature dependence of the uniform magnetic susceptibility has been observed in the nonmagnetic normal state of iron-pnictides. This non-Pauli and non-Curie-W…
Funtional Renormalization Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs Based High Temperature Superconductors
Fa Wang, Hui Zhai, Ying Ran +2
We apply the fermion functional renormalization group method to determine the pairing symmetry and pairing mechanism of the FeAs-Based materials. Within a five band model with pure…
A direct transition between a Neel ordered Mott insulator and a superconductor on the square lattice
Ying Ran, Ashvin Vishwanath, Dung-Hai Lee
In this paper we study a bandwidth-controlled direct, continuous, phase transition from a Mott insulator, with easy plane Neel order, to a fully gapped superconductor…
Nodal Spin Density Wave and band topology of the FeAs based materials
Ying Ran, Fa Wang, Hui Zhai +2
The recently discovered FeAs-based materials exhibit a Spin Density Wave (SDW) in the undoped state, which gives way to superconductivity upon doping. Here we show that due…
A Numerical Renormalization Group Study of the Superconducting and Spin Density Wave Instabilities in MFeAsOF Compounds
Fa Wang, Hui Zhai, Ying Ran +2
We apply the fermion renormalization group method, implemented numerically by Honerkamp et.al., to a two-band model of FeAs-based materials. At half filling we find the or…
Spin-charge Separated Solitons in a Topological Band Insulator
Ying Ran, Ashvin Vishwanath, Dung-Hai Lee
In this paper we construct a simple, controllable, two dimensional model based on a topological band insulator. It has many attractive properties. (1) We obtain spin-charge separat…