We expand the phase diagram of two-dimensional, nonsymmorphic crystals at integer fillings that do not guarantee gaplessness. In addition to the trivial, gapped phase that is expected, we find that band inversion leads to a class of topological, gapless phases. These topological phases are exemplified by the monolayers of MTe_{2} (M=W,Mo) if spin-orbit coupling is neglected. We characterize the Dirac band touching of these topological metals by the Wilson loop of the non-Abelian Berry gauge field. Furthermore, we develop a criterion for the proximity of these topological metals to 2D and 3D Z_{2} topological insulators when spin-orbit coupling is included; our criterion is based on nonsymmorphic symmetry eigenvalues, and may be used to identify topological materials without inversion symmetry. An additional feature of the Dirac cone in monolayer MTe_{2} is that it tilts over in a Lifshitz transition to produce electron and hole pockets—a type-II Dirac cone. These pockets, together with the pseudospin structure of the Dirac electrons, suggest a unified, topological explanation for the recently reported, nonsaturating magnetoresistance in WTe_{2}, as well as its circular dichroism in photoemission. We complement our analysis and first-principles band structure calculations with an ab-initio-derived tight-binding model for the WTe_{2} monolayer.

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electron and hole pocketsa typeii dirac cone trivial gapped phase wilson loop of metals circular topological explanation abinitioderived tightbinding model lifshitz transition pseudospin structure of the dirac electrons 2d monolayers of mte2 dirac band touching spinorbit coupling nonabelian berry gauge field twodimensional nonsymmorphic crystals 3d z2 topological insulators nonsaturating magnetoresistance wte2 monolayer

A. Alexandradinata,Lukas Muechler,Titus Neupert,Roberto Car,.Topological Nonsymmorphic Metals from Band Inversion. 6 (4),.

A. Alexandradinata,Lukas Muechler,Titus Neupert,Roberto Car,"Topological Nonsymmorphic Metals from Band Inversion" 6

A. Alexandradinata,Lukas Muechler,Titus Neupert,Roberto Car,"Topological Nonsymmorphic Metals from Band Inversion"