34 citations · 100 across the 8 of their papers we have counts for
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math-ph2006★ 34 cited
Levinson's theorem for Schroedinger operators with point interaction: a topological approach
Johannes Kellendonk, Serge Richard
In this note Levinson theorems for Schroedinger operators in R^n with one point interaction at 0 are derived using the concept of winding numbers. These results are based on new ex…
math-ph2006★ 18 cited
Topological boundary maps in physics: General theory and applications
Johannes Kellendonk, Serge Richard
The material presented here covers two talks given by the authors at the conference Operator Algebras and Mathematical Physics organised in Bucharest in August 2005. The first one…