Quantum Phase Transitions of Frustrated Heisenberg Antiferromagnets: a Comprehensive Renormalization Approach

Institut fu¨r Theoretische Physik, Universit¨at zu K¨oln, Zu¨lpicher Str. 77, D-50937 K¨oln, Germany(Dated: February 2, 2008)We develop a novel renormalization approach for frustrated quantum antiferromagnets. It isdesigned to consistently treat spin-wave interactions all over the magnetic Brillouin zone, includinghigh-energy modes in outer regions as well as low energy modes in the center. Focusing on theparadigmatic J