Dispersionless wave packets in Dirac materials
  We show that a wide class of quantum systems with translational invariance can host dispersionless, soliton-like, wave packets. We focus on the setting where the effective, two-dimensional Hamiltonian acquires the form of the Dirac operator. The proposed framework for construction of the dispersionless wave packets is illustrated on silicene-like systems with topologically nontrivial effective mass. Our analytical predictions are accompanied by a numerical analysis and possible experimental realizations are discussed. 
Vit Jakubsky, Matej Tusek
cond-mat.mes-hall hep-th math-ph math.MP quant-ph