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Pseudogap in underdoped cuprates and spin-density-wave fluctuations

机译：伪掺杂的铜酸盐中的Pseeudogap和自旋密度波波动

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摘要

We analyze fermionic spectral function in the spin-density-wave (SDW) phase of quasi-two-dimensional (quasi-2D) cuprates at small but finite T. We use a nonperturbative approach and sum up infinite series of thermal self-energy terms, keeping at each order nearly divergent (T/J)|log ∈| terms, where e is a deviation from a pure 2D, and neglecting regular T/J corrections. We show that, as SDW order decreases, the spectral function in the antinodal region acquires peak/hump structure: the coherent peak position scales with SDW order parameter while the incoherent hump remains roughly at the same scale as at T=0 when SDW order is the strongest. We identify the hump with the pseudogap observed in angle-resolved photoemission spectros-copy and argue that the presence of coherent excitations at low energies gives rise to magneto-oscillations in an applied field. We show that the same peak/hump structure appears in the density of states and in optical conductivity.
机译：我们在小而有限的T下分析准二维（准2D）铜酸盐的自旋密度波（SDW）相中的铁离子光谱函数。我们使用非摄动方法并总结了无穷系列的热自能项，几乎每个阶差（T / J）| log∈|项，其中e是与纯2D的偏差，而忽略了常规的T / J校正。我们显示出，随着SDW阶降低，反节点区域的频谱函数获得峰/峰结构：相干峰位置随SDW阶参数缩放，而非相干峰则与SDW阶为T = 0时大致保持相同的尺度。最强的。我们用在角分辨光发射光谱学中观察到的伪间隙来识别驼峰，并指出在低能量下相干激发的存在会在应用领域引起磁振荡。我们表明，相同的峰/峰结构出现在状态密度和光导率中。

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