论文标题
LA（0001）的Stark偏移的TAMM型表面状态的光谱签名
Spectroscopic signature of the Stark-shifted Tamm-type surface state of La(0001)
论文作者
论文摘要
我们通过隧道光谱法在较宽的隧道电流范围内从0.1 Na到8000 Na进行了隧道光谱，从而研究了LA的TAMM型表面状态（0001），从而调节了尖端空间样品样品中的电场强度。我们观察到没有占用的TAMM型表面状态的显着转移，并随着电场强度的增加向费米能量，并伴随着谐振峰的扩大，表明表面状态寿命的降低。我们的实验结果与先前关于贵金属（111）表面的鲜明冲击型表面状态的报道相反。
We have studied the Tamm-type surface state of La(0001) by tunneling spectroscopy within a wide range of tunneling currents from 0.1 nA to 8000 nA, thereby tuning the electric-field strength in a tip-vacuum-sample tunnel junction. We observe a significant shift of the unoccupied Tamm-type surface state toward the Fermi energy with increasing electric-field strength, accompanied by a broadening of the width of the resonance peak indicating a decrease of the surface-state lifetime. Our experimental results are contrary to previous reports for Stark-shifted Shockley-type surface states of noble metal (111) surfaces.
