The Topological Non-connectivity Threshold in quantum long-range   interacting spin systems
  Quantum characteristics of the Topological Non-connectivity Threshold (TNT), introduced in F.Borgonovi, G.L.Celardo, M.Maianti, E.Pedersoli, J. Stat. Phys., 116, 516 (2004), have been analyzed in the hard quantum regime. New interesting perspectives in term of the possibility to study the intriguing quantum-classical transition through Macroscopic Quantum Tunneling have been addressed. 
F.Borgonovi, G.L.Celardo, R.Trasarti-Battistoni