possible higher dimensional lattices research bloch spin waves n el antiferromagnetism led developing new magnetic materials applications magnetic storage devices ref name mattis magnetism modern many body physics magnet levitating high temperature superconductor today physicists working understand high temperature superconductivity using ads cft correspondence sommerfeld model spin models ferromagnetism illustrated successful application quantum mechanics condensed matter problems however still several unsolved problems notably description superconductivity kondo effect ref name coleman ref world war ii several
Natural science Physics Condensed matter physics