论文标题
强烈电子相关引起的低频磁振荡
Low-frequency magnetic oscillations induced by strongly electron correlations
论文作者
论文摘要
为了解释在轻微掺杂的铜矿中观察到的量子振荡的低频，我们考虑了补充垂直磁场的二维哈驼bard模型。对于大型哈伯德排斥，使用簇扰动理论研究了电子光谱。在与半填充的小偏差处获得的磁振荡的频率接近实验观察到的频率，$ f \ \ \ ^ of500 $ 〜t。它们源自位于布里渊区的节点区域的小费米表面袋。口袋是由费米（Fermi）弧和较少密集的段形成的，这使得口袋几乎圆形。
To explain the low frequencies of quantum oscillations observed in lightly doped cuprates, we consider the two-dimension Hubbard model supplemented with the perpendicular magnetic field. For large Hubbard repulsions, the electron spectrum is investigated using the cluster perturbation theory. Obtained frequencies of magnetic oscillations at small deviations from half-filling are close to those observed experimentally, $F\approx500$~T. They stem from small Fermi surface pockets located in the nodal regions of the Brillouin zone. The pockets are formed by Fermi arcs and less intensive segments, which make the pockets nearly circular.
