Repp Jascha, Meyer Gerhard, Paavilainen Sami, Olsson Fredrik E, Persson Mats
IBM Research, Zurich Research Laboratory, 8803 Rüschlikon, Switzerland.
Phys Rev Lett. 2005 Nov 25;95(22):225503. doi: 10.1103/PhysRevLett.95.225503. Epub 2005 Nov 21.
Broad Gaussian line shapes are observed in scanning tunneling spectroscopy of single, localized electronic states induced by Cl vacancies in ultrathin NaCl films on Cu surfaces. Using a simple inelastic resonance tunneling model, we show that the observed broad line shapes are caused by a strong coupling between the localized state and the optical phonons in the film. The parameters for the model are obtained from density functional calculations, in which the occupation of the vacancy state temporarily taking place in the experiment has also been accounted for.
在铜表面超薄氯化钠薄膜中由氯空位诱导产生的单个局域电子态的扫描隧道谱中观察到了宽高斯线形。通过一个简单的非弹性共振隧穿模型，我们表明观察到的宽线形是由薄膜中局域态与光学声子之间的强耦合引起的。该模型的参数是从密度泛函计算中获得的，其中还考虑了实验中暂时出现的空位态占据情况。
