论文标题
表面超导体SI（111） - （root7xroot3） - 带有吸附有机分子的TC增强的非电荷转移起源
Non-charge-transfer origin of Tc Enhancement in a Surface Superconductor Si(111)-(root7xroot3)-In with Adsorbed Organic Molecules
论文作者
论文摘要
通过超高真空环境下的运输测量，研究了Zn-甲状腺素（ZnPC）分子吸附对Si（111） - （root7XRoot3）-in表面的超导性的影响。发现ZNPC分子在最大情况下将过渡温度TC提高11％，约为使用CUPC报道的TC增加的2.7倍。相比之下，角度分辨的光发射光谱测量和从头算计算表明，从原子层到ZNPC的电荷转移大大比杯子小得多。这清楚地表明，应将电荷转移排除在TC中增加的起源。将分子的物理吸附引起的推回效应被讨论为TC增强的可能机制。
The effects of adsorption of Zn-phthalocyanine (ZnPc) molecules on the superconductivity of the Si(111)-(root7xroot3)-In surface are studied through transport measurements under ultrahigh vacuum environment. The ZnPc molecules are found to increase the transition temperature Tc by 11% at maximum, which is about 2.7 times the Tc increase previously reported using CuPc. By contrast, angle-resolved photoemission spectroscopy measurements and ab initio calculations show that charge transfer from the In atomic layers to ZnPc is substantially smaller than that to CuPc. This clearly shows that charge transfer should be excluded as the origin of the increase in Tc. The push-back effect induced by physical adsorption of molecules is discussed as a possible mechanism for the Tc enhancement.
