Sakurai M, Thirstrup C, Aono M
National Institute for Materials Science, Namiki, Tsukuba, Ibaraki 305-0044, Japan.
Phys Rev Lett. 2004 Jul 23;93(4):046102. doi: 10.1103/PhysRevLett.93.046102. Epub 2004 Jul 21.
It is reported that optical selection rules still apply in light emission from the scanning tunneling microscope (STM). Linear polarization of isochromat light emitted from the tunneling gap between a STM tip made of tungsten (W) and a silicon (Si) sample with a (001) clean surface strongly depends on the bias voltage between tip and sample. The results show that pi* and sigma* surface states, for example, of the Si(001) sample contribute to emission of p- and s-polarized light, respectively, in accordance with optical selection rules.
据报道，光学选择规则在扫描隧道显微镜（STM）的发光过程中仍然适用。由钨（W）制成的STM针尖与具有（001）清洁表面的硅（Si）样品之间的隧道间隙发出的等色线光的线性偏振强烈依赖于针尖与样品之间的偏置电压。结果表明，例如，Si(001)样品的π和σ表面态分别根据光学选择规则对p偏振光和s偏振光的发射有贡献。
