Kate Gardner Burt, Pamela Koch, Isobel Contento
Development of the GREEN (Garden Resources, Education, and Environment Nexus) Tool: An Evidence-Based Model for School Garden Integration
Journal of the Academy of Nutrition and Dietetics
discuss physical properties integer topological phases bosons d31 dimensions protected internal symmetries like time reversal andor charge conservation phases invoke interactions fundamental way possess topological order bosonic analogs free fermion topological insulators superconductors formal cohomology based classification states recently discovered physical properties remain mysterious develop field theoretic description several states show possess unusual surface states gapped must either break underlying symmetry develop topological order latter case symmetries implemented way forbidden strictly two dimensional theory usual fate surface states exotic gapless states also realized example tuning parameters naturally lead deconfined quantum critical point situations fully symmetric vortex metal phase discuss cases topological phases characterized quantized magnetoelectric response theta somewhat surprisingly odd multiple 2pi two different surface theories shown capture phenomena first nonlinear sigma model topological term second invokes vortices surface transform projective representation symmetry group bulk field theory consistent properties identified multicomponent bf theory supplemented crucially topological term possible topological phase characterized thermal analog magnetoelectric effect also discussed