Unconventional non-Fermi liquid state caused by nematic criticality in cuprates
Unconventional non-Fermi liquid state caused by nematic criticality in cuprates
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DOI：
10.1088/1367-2630/18/7/073023
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发表时间：
2016-07
影响因子：
3.3
通讯作者：
Jing-Rong Wang;Guo-Zhu Liu;Changjin Zhang
中科院分区：
文献类型：
--
作者：
Jing-Rong Wang;Guo-Zhu Liu;Changjin Zhang
At the nematic quantum critical point that exists in the d x 2 − y 2 -wave superconducting dome of cuprates, the massless nodal fermions interact strongly with the quantum critical fluctuation of nematic order. We study this problem by means of the renormalization group approach and show that, the fermion damping rate ∣ Im Σ R ( ω ) ∣ vanishes more rapidly than the energy ω and the quasiparticle residue Z f → 0 in the limit ω → 0 . The nodal fermions thus constitute an unconventional non-Fermi liquid that represents an even weaker violation of Fermi liquid theory than a marginal Fermi liquid. We also investigate the interplay of quantum nematic critical fluctuation and gauge-potential-like disorder, and find that the effective disorder strength flows to the strong coupling regime at low energies. Therefore, even an arbitrarily weak disorder can drive the system to become a disorder controlled diffusive state. Based on these theoretical results, we are able to understand a number of interesting experimental facts observed in curpate superconductors.
