Macridin Alexandru, Jarrell M, Maier Thomas, Kent P R C, D'Azevedo Eduardo
University of Cincinnati, Cincinnati, Ohio, 45221, USA.
Phys Rev Lett. 2006 Jul 21;97(3):036401. doi: 10.1103/PhysRevLett.97.036401. Epub 2006 Jul 19.
Using the dynamical cluster approximation and quantum Monte Carlo simulations we calculate the single-particle spectra of the Hubbard model with next-nearest neighbor hopping . In the underdoped region, we find that the pseudogap along the zone diagonal in the electron doped systems is due to long-range antiferromagnetic correlations. The physics in the proximity of (0, pi) is dramatically influenced by t' and determined by the short range correlations. The effect t' of on the low-energy angle-resolved photoemission spectroscopy spectra is weak except close to the zone edge. The short range correlations are sufficient to yield a pseudogap signal in the magnetic susceptibility and produce a concomitant gap in the single-particle spectra near (pi, pi/2), but not necessarily at a location in the proximity of the Fermi surface.
利用动态团簇近似和量子蒙特卡罗模拟，我们计算了具有次近邻跃迁的哈伯德模型的单粒子能谱。在欠掺杂区域，我们发现电子掺杂系统中沿区域对角线的赝能隙是由于长程反铁磁关联。在(0, π)附近的物理性质受到t'的显著影响，并由短程关联决定。t'对低能角分辨光电子能谱的影响较弱，除非靠近区域边缘。短程关联足以在磁化率中产生赝能隙信号，并在(π, π/2)附近的单粒子能谱中产生伴随能隙，但不一定在费米面附近的位置。
