  Forced desorption of a semiflexible polymer chain on a solid substrate is
theoretically investigated. The pulling force versus displacement is studied
for different adsorption energy and persistence length P. It is found that the
relationships between pulling force and cantilever displacement show a series
of characteristic force spikes at different persistence length P. These force
spikes becomes more pronounced but the average magnitude of this force decrease
as P grows. Our results are of relevance to forced desorption of DNA on an
attractive wall in single-molecule pulling experiments.
