Vibration of the dimer on Si(001) surface excited by STM current

Hiroshi Kawai, Osamu Narikiyo

研究成果: ジャーナルへの寄稿学術誌査読

21 被引用数 (Scopus)


The vibration of the dimer excited by STM current on Si(001) surface is investigated. We describe this system by the Hamiltonian which has the electron-vibration coupling term as the key ingredient. In order to characterize the transition rates induced by STM current between vibrational states we have introduced the effective temperature of the vibration which differs from the temperature of the substrate. The behavior of the effective temperature depends on the substrate temperature and STM current in highly nonlinear manner and qualitatively changes around 50 K of the substrate temperature. At lower temperatures, the effective temperature strongly deviates from the substrate temperature and reaches a few hundred Kelvin for the typical values of STM current. At higher substrate temperatures, the effective temperature reduces to the substrate temperature. On the basis of these behaviors of the effective temperature, we solve the puzzle of the symmetric-asymmetric crossover in dimer images of STM observation in the ordered state of c(4 x 2).

ジャーナルjournal of the physical society of japan
出版ステータス出版済み - 2月 2004

!!!All Science Journal Classification (ASJC) codes

  • 物理学および天文学一般


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