论文标题
自发磁场和状态的局部密度靠近YBCO的时间反转对称性损坏的表面状态
Spontaneous Magnetic Field and Local Density of States near a Time-Reversal Symmetry Broken Surface State of YBCO
论文作者
论文摘要
从理论上讲，我们通过使用Bogoliubov-de Gennes方法处理Bogoliubov-De Gennes方法来研究（110）Cuprate High-t_c $超导体YBCO的（110）表面（110）表面附近的自发磁场的空间分布。在（110）表面附近，其中$ d_ {x^2-y^2} $ - 波超导性被强烈抑制，通量相位阶在本地发生，导致时间反向对称性破碎的表面状态。由于在两层中流动的自发性电流是抗植物的，因此自发的磁场很小。它们存在于超导体内部的一个狭窄区域，无论温度如何，在外部都消失了。该结果，加上状态局部密度的零能量峰的分裂，可以为YBCO的多个实验提供一致的解释。
We study theoretically the spatial distribution of spontaneous magnetic fields near a (110) surface of cuprate high-$T_C$ superconductor YBCO by treating a bilayer $t-J$ model with the Bogoliubov-de Gennes method. Near a (110) surface where $d_{x^2-y^2}$-wave superconductivity is strongly suppressed, flux phase order occurs locally leading to a time-reversal symmetry broken surface state. Since the spontaneous currents flowing in the flux phase in two layers are antiparallele, resulting spontaneous magnetic fields are quite small. They exist in a narrow region inside the superconductor, and essentially vanish outside irrespective of the temperature. This result, together with the splitting of zero-energy peak of the local density of states, can provide consistent explanations for several experiments on YBCO.
