Abstract
The time evolution of a spin operator (t) in a nearest-neighbor S=1/2 semi-infinite XY chain is considered at T=∞. It is shown that the surface spin relaxes very differently compared to the subsurface spin, which already behaves like a bulk spin. The transition from surface to bulk dynamics is discussed using the recurrence-relations method of solving the Heisenberg equation of motion.
- Received 25 October 1990
DOI:https://doi.org/10.1103/PhysRevB.43.10990
©1991 American Physical Society