74 citations · 208 across the 17 of their papers we have counts for
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math-ph2014★ 10 cited
Quantum networks: Anti-core of spin chains
E. Jonckheere, F. C. Langbein, S. Schirmer
The purpose of this paper is to exhibit a quantum network phenomenon - the anti-core---that goes against the classical network concept of congestion core. Classical networks ideali…
math-ph2012★ 6 cited
Curvature of quantum rings
Edmond Jonckheere, Frank Langbein, Sophie Schirmer
We develop a geometric approach to spin networks with Heisenberg or XX coupling. Geometry is acquired by defining a distance on the discrete set of spins. The key feature of the ge…