Matthias Geilhufe, a Research Scientist, Nordita, Sweden

3-Dimensional Organic Dirac Materials From a Data Mining Approach

The study of Dirac materials, i.e., materials where the low-energy fermionic excitations behave as massless Dirac particles has been of ongoing interest for more than two decades. Such massless Dirac fermions are characterized by a linear dispersion relation with respect to the particle momentum. To identify Dirac materials in the class of 3-dimensional organic crystals we build up an organic materials database (OMDB) and apply methods of data mining. Post-processing of the obtained materials by means of group theory leads to topologically protected crossings which can be identified in different space groups. During the talk I will introduce the organic materials database and present it's potential for applications in various fields of condensed matter physics. As an example I concentrate on the search for Dirac materials, show particular examples and explain the topological protection of the found Dirac crossings.