Broken-Symmetry Band Structure of Ditetramethyltetraselenafulvalene-X[(TMTSF)2X]

The author derives a set of two-dimensional band structures arising from spin- and/or lattice-induced commensurate symmetry breaking of the high-temperature, ambient-pressure phase of ditetramethyltetraselenafulvalene-$X$. These band structures are proposed as the framework for many of the low-temperature transport properties of these compounds and are shown to be consistent with experiment in those cases where the broken symmetry conditions have been well established.