Phys. Rev. Lett. 85, 5603 - 5606 (2000)Unique Dynamic Appearance of a Ge-Si Ad-dimer on Si(001)
Zhong-Yi Lu1, Feng Liu2 *, Cai-Zhuang Wang1, X. R. Qin2, B. S. Swartzentruber3, M. G. Lagally2, and Kai-Ming Ho1 Received 5 July 2000 We carry out a comparative study of the energetics and dynamics of Si-Si, Ge-Ge, and Ge-Si ad-dimers on top of a dimer row in the Si(001) surface, using first-principles calculations. The dynamic appearance of a Ge-Si dimer is distinctively different from that of a Si-Si or Ge-Ge dimer, providing a unique way for its identification by scanning tunneling microscopy (STM). Its “rocking” motion, observed in STM, actually reflects a 180° rotation of the dimer, involving a piecewise-rotation mechanism. The calculated energy barrier of 0.74 eV is in good agreement with the experimental value of 0.82 eV. ©2000 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevLett.85.5603 * Present address: Materials Science and Engineering Department, University of Utah, Salt Lake City, Utah 84112. [ Abstract | Previous article | Next article | Issue 26 ] |
A new free weekly publication from APS 
Read the latest from Physics:
Viewpoint: Can superconducting rings provide clues to the early development of the universe? |
About PROLA | Terms and Conditions | Subscriptions | Search | Help
Content in PROLA © 2009 by The American Physical Society All rights reserved. PROLA™ is a trademark of The American Physical Society. Use of APS online journals implies that the user has read and agrees to the Terms and Conditions in the Subscription Agreement.