Femtosecond studies of electron dynamics in 2-D: Surfaces, interfaces and devices
- Univ. of California, Berkeley, CA (United States)
Angle and time resolved femtosecond two-photon photoemission is utilized to probe the dynamics of electrons at surfaces and interfaces. A femtosecond laser is used to create an excited electronic distribution at an interface which is photoejected some time later by a probe pulse after which the kinetic energy is measured. Studies of various insulator/metal interfaces show that the dynamics are largely determined by the electron affinity of the adsorbate. In the case of a repulsive electron affinity, the dynamics can best be described as due to tunneling through the repulsive barrier presented by the adlayer. For two or more layers, 2-D small-polaron localization of the initially delocalized electron occurs and can be directly measured on the fs timescale. Adsorbates with a positive electron affinity form an attractive well, giving rise to quantum well states which contain important information about band structure and carrier dynamics at the interface.
- OSTI ID:
- 560427
- Report Number(s):
- CONF-970443--
- Country of Publication:
- United States
- Language:
- English
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