La（0001）斯塔克位移Tam型表面态的光谱特征
Spectroscopic signature of the Stark-shifted Tamm-type surface state of La(0001)
摘要：
我们用隧道光谱研究了La（0001）的Tamm-type表面态，在0.1 nA ~ 8000 nA的宽范围内，对针尖-真空-样品隧道结中的电场强度进行了调谐。随着电场强度的增加，未被占据的Tamm-type表面态向费米能方向移动，同时共振峰的宽度变宽，表明表面态寿命降低。我们的实验结果与之前关于贵金属（111）表面斯塔克位移肖克利型表面态的报道相反。
英文摘要：
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.
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